Correct Answer: A

Rationale: Overly aggressive behavior is often a major factor in a child's rejection by peers. Children who display overly aggressive behavior may intimidate or harm their peers, leading to social rejection. Being too intelligent or having a different socioeconomic background are not typically primary reasons for peer rejection. While empathy is important for healthy social interactions, a lack of empathy, on its own, is less likely to be a primary factor in peer rejection compared to overly aggressive behavior.

Correct Answer: B

Rationale: The correct definition of resilience is the ability to adapt successfully to difficult circumstances, not avoiding stress entirely. Resilience is significant in mental health as it helps individuals overcome adversity rather than avoiding it. Choice A is incorrect as resilience doesn't mean avoiding all mental health issues but rather dealing with stress effectively. Choice C is incorrect as resilience involves facing and overcoming stress, not being unaffected by it. Choice D is incorrect as resilience involves facing challenges and stress, not avoiding them altogether.

Correct Answer: B

Rationale: The correct answer is B because most behaviors are influenced by a complex interaction of many genes and the environment. Choice A is incorrect because it states that it is easy to differentiate between the effects of the environment and genes, which is not the case. Choice C is incorrect because although twin studies are commonly used in genetic research, this alone does not hinder the full understanding of genetic influences on behavior. Choice D is incorrect because even though we have some understanding of how genes impact brain chemistry, this does not mean that we fully understand the genetic influences on behavior.

Correct Answer: A

Rationale: A diathesis is indeed the correct term for a predisposition toward developing a disorder. A diathesis refers to an underlying vulnerability or predisposition to a particular condition. Choice B, 'comorbidity,' refers to the presence of two or more disorders in the same individual. Choice C, 'genotype,' relates to an individual's genetic makeup. Choice D, 'phenotype,' refers to the observable characteristics of an organism resulting from the interaction of its genotype with the environment. Therefore, A is the most appropriate term for describing a predisposition toward developing a disorder.

Correct Answer: B

Rationale: Early life experiences are crucial in shaping brain development and later behavior. These experiences play a significant role in laying the foundation for future mental health and behavior. Choice A is incorrect because early life experiences do have a profound impact on brain development. Choice C is incorrect as early life experiences are indeed significant in brain development. Choice D is incorrect as early life experiences can have lasting effects into adulthood.