Final answer:
Early maturation is associated with an increase in risky behavior in both boys and girls, leading to a higher likelihood of engaging in substance abuse, early sexual activity, and experiencing depression or eating disorders.
Step-by-step explanation:
The correct answer to the question is: A. Early; boys and girls. Research has shown that early maturation is associated with an increase in risky behavior in both boys and girls. Early maturing boys are more likely to engage in behaviors such as substance abuse and early sexual activity, potentially due to their increased strength, height, and athleticism, as well as greater popularity and confidence compared to their peers. Early maturing girls, however, may experience a high risk for depression, substance abuse, and eating disorders. They may feel self-conscious about their developing bodies due to being teased or overly admired. Late maturing boys and girls can also experience self-consciousness about their lack of physical development, but the risks associated with early maturation in terms of risky behavior are more pronounced.