Correct Answer: A

Rationale: The corrected statement 'Paul learned to play the violin at a young age' provides an example of an age-graded influence. This is because learning to play the violin is a behavior that is typical or expected at a certain age, reflecting how age influences individuals' experiences and development. In contrast, choices B, C, and D do not directly relate to age-graded influences. Jack's enjoyment of hiking, Sarah's preference for reading mystery novels, and Alex's proficiency in mathematics are not inherently tied to age-related developmental influences.

Correct Answer: D

Rationale: High-quality child care that is affordable and reliable can help prevent escalating demands on families that lead to chaos. This is achieved by providing a stable and supportive environment for children, enabling parents to balance work and family responsibilities effectively. Access to reliable child care reduces stress and helps in preventing chaos within the family, ultimately leading to improved well-being for both parents and children. Choices A, B, and C are incorrect as they do not directly address the need for external support to manage family demands and prevent chaos. Parental multitasking, eating separate meals, and compressing family routines may not provide the necessary stability and support required to prevent escalating demands on families.

Correct Answer: B

Rationale: Central to Piaget's theory is the concept of adaptation, which refers to the process by which individuals adjust to new information and experiences by modifying their existing cognitive structures. Piaget believed that this process of adaptation involved two key components: assimilation, where individuals incorporate new information into their existing schemas, and accommodation, where individuals adjust their schemas to fit new information. This concept highlights the dynamic nature of cognitive development and the importance of interaction between individuals and their environment in shaping intellectual growth. Choice A, 'imitation,' is incorrect as Piaget's theory focuses on how individuals actively construct their understanding of the world through their interactions with it, rather than simply imitating others. Choice C, 'self-efficacy,' is not the central concept in Piaget's theory; self-efficacy is a concept from Bandura's social cognitive theory. Choice D, 'scaffolding,' is associated with Vygotsky's sociocultural theory, not Piaget's theory.

Correct Answer: A

Rationale: Impaired brain functioning is a major contributor to Sudden Infant Death Syndrome (SIDS). Research has shown that abnormalities in the brainstem, which controls automatic functions like breathing and heart rate, can play a role in SIDS cases. As such, mounting evidence suggests that compromised brain functioning is a significant factor in the occurrence of SIDS. Choices B, C, and D are incorrect. Higher-than-average birth weight, organized and patterned sleep behavior, and a family history of chromosomal abnormalities are not identified as major contributors to SIDS according to the provided information.

Correct Answer: A

Rationale: The limitation of the ethnographic method is that investigators' cultural values sometimes lead them to misinterpret what they see. This can introduce bias into the observations and potentially impact the accuracy of the findings. It is important for researchers to be aware of their own biases and strive to minimize their influence when conducting ethnographic studies. Choice B is incorrect because ethnographic methods actually aim to provide rich information on how individuals behave within their cultural contexts. Choice C is incorrect as ethnographic methods typically involve direct observation and participation rather than unobtrusive techniques like surveillance cameras. Choice D is incorrect because one of the strengths of ethnographic research is its ability to uncover the reasoning behind participants' responses by immersing the researcher in the cultural setting.