Final answer:
The cognitive changes of adolescence allow adolescents to develop a personal system of values and to better weigh opinions, leading to more independent decisions. Options c and d are true regarding these changes.
Step-by-step explanation:
The cognitive changes of adolescence result in a number of behavioral shifts. Options c and d are true of the cognitive changes of adolescence. Adolescents develop a personal system of values as they mature and refine their sense of self. They are more capable of abstract thought, which includes developing their own system of moral and ethical values and becoming more separated emotionally from their parents. Adolescents' increased cognitive capabilities allow them to weigh the opinions of others and make independent decisions. This aligns with them being more likely to question authority and challenge societal norms, reflecting their more sophisticated thinking abilities and the capacity for individual judgment.
The cognitive changes of adolescence include a development of a personal system of values, an ability to think abstractly, and an increased capacity for insight and judgment through experience. Adolescents become less emotionally attached to their parents and more influenced by and conforming to their peer group.