Correct Answer: D

Rationale: Dr. Langley's work being focused on understanding constancy and change throughout the lifespan aligns with the field of developmental science, which studies how individuals grow and change from birth through old age. This field encompasses the study of physical, cognitive, social, emotional, and other aspects of development across the lifespan. Choice A, genetics, primarily focuses on the study of genes, heredity, and genetic variation, which is not directly related to understanding constancy and change throughout the lifespan. Choice B, clinical psychology, concentrates on the diagnosis and treatment of mental, emotional, and behavioral disorders rather than the broader study of development across the lifespan. Choice C, adolescent development, is more specific and limited in scope compared to the comprehensive study of development across the entire lifespan, which is the focus of developmental science.

Correct Answer: B

Rationale: According to research on family chaos, mothers who frequently multitask experience greater psychological stress. Multitasking can lead to increased stress levels as individuals juggle multiple responsibilities and tasks simultaneously, leading to a sense of being overwhelmed and unable to focus effectively. This can contribute to higher levels of psychological stress for mothers in particular, impacting their overall well-being. Choices A, C, and D are incorrect because the research specifically links frequent multitasking, not making family meals, working outside the home, or cosleeping with infants, to greater psychological stress among mothers.

Correct Answer: A

Rationale: According to Jean Piaget's cognitive-developmental theory, children actively construct knowledge as they manipulate and explore their world. Piaget emphasized that children learn through their own actions and interactions with the environment, leading to cognitive development. Choice B is incorrect because Piaget's theory focuses on children's active engagement in learning rather than passive reinforcement. Choice C is incorrect because Piaget's theory highlights the child's role in constructing knowledge, not solely relying on adult teaching. Choice D is incorrect as it refers to sensitive periods, a concept more associated with other developmental theories like Erikson's psychosocial theory, not Piaget's cognitive-developmental theory.

Correct Answer: B

Rationale: Ecological systems theory views the person as developing within a complex system of relationships affected by multiple levels of the surrounding environment. This perspective emphasizes the interconnectedness of individuals with their social and physical environment, recognizing that development is influenced by various factors interacting at different levels of the ecological system. Choice A is incorrect because it describes a genetically determined development process, which is not the focus of ecological systems theory. Choice C is incorrect because it highlights observational learning as the primary influence on development, neglecting the broader environmental factors. Choice D is incorrect as it compares the person to a computer system, which does not align with the principles of ecological systems theory.

Correct Answer: A

Rationale: A major strength of the longitudinal design is that researchers can examine relationships between early and later behaviors. This design allows researchers to observe and track changes in the same participants over an extended period of time, providing valuable insights into developmental trajectories and how behaviors are connected across different stages of life. Choice B is incorrect because longitudinal studies track changes over time, not necessarily collect a large amount of data in a short time span. Choice C is incorrect as it refers to cross-sectional studies rather than longitudinal studies. Choice D is incorrect as it describes a cross-sectional design where participants of different ages are studied at the same time.