Correct Answer: C

Rationale: The correct answer is C: 'Undercontrolled behavior tends to be seen in American children, whereas overcontrolled behavior is seen in Thai children.' This statement is supported by cultural studies and observations. American children are often described as exhibiting undercontrolled behavior, which includes impulsivity and lack of inhibition. On the other hand, Thai children are often described as showing overcontrolled behavior, characterized by restraint and adherence to social norms. Choice A is incorrect because calm behavior is not typically associated with American children. Choice B is incorrect as overcontrolled behavior is not commonly associated with American children. Choice D is incorrect as there are observed differences in behavioral traits between American and Thai children.

Correct Answer: D

Rationale: Down syndrome is caused by possessing an extra chromosome in chromosome 21, not by a chemical imbalance (choice A), a gene on the X chromosome (choice B), or possessing an extra X chromosome (choice C). The presence of an additional chromosome 21 disrupts the normal course of development and leads to the characteristics associated with Down syndrome.

Correct Answer: D

Rationale: The correct answer is D, Neglectful/uninvolved. This parenting style is associated with a lack of social skills, poor school performance, and moodiness due to the lack of parental involvement and emotional support. Authoritarian parenting (choice A) is characterized by strict rules and high demands, not necessarily linked to these issues. Permissive/indulgent parenting (choice B) involves few rules and high responsiveness, which may not directly lead to these problems. Authoritative parenting (choice C) combines high demands with emotional support and is actually linked to positive outcomes such as good school performance and social skills.

Correct Answer: D

Rationale: The biopsychosocial perspective is the correct answer as it considers biological, sociological, and psychological factors associated with a person's behaviors. This perspective emphasizes the interconnection between these factors in understanding human behavior. Choice A, Behavioral perspective, focuses primarily on observable behaviors and how they are influenced by the environment. Choice B, Cognitive-behavioral perspective, combines elements of cognitive and behavioral theories to understand behavior but does not encompass sociological factors. Choice C, Psychodynamic perspective, emphasizes unconscious processes and early childhood experiences as determinants of behavior, neglecting the sociological aspect.

Correct Answer: B

Rationale: Early intervention is crucial in preventing or mitigating the development of mental disorders by addressing issues before they fully develop. Choice A is incorrect because early intervention plays a significant role in preventing mental disorders. Choice C is incorrect as early intervention aims to improve mental health outcomes. Choice D is incorrect as early intervention is effective across various stages of mental health conditions, not just in severe cases.