One explanation for the risk-taking peak that scientists have observed in adolescence is that:

a. Adolescents are not aware of the risks associated with certain behaviors.
b. The prefrontal cortex is fully developed years before the limbic system is active.
c. Adolescents tend to be higher in sensation seeking and impulsivity than children and adults are.
d. Few or no adolescents are capable of conducting a cost-benefit analysis.