28. Donna is concerned about her adolescent daughter's tendency to flare up at the mildest provocations. Donna says that her daughter refuses to see reason sometimes and seems unable to exercise much self-control. As a specialist in the development of adolescents, you would tell Donna that her daughter's behavior could partly be explained by the biological reason that:A. the prefrontal cortex—involved in reasoning and self-control—has developed fully by early adolescence.B. the corpus callosum, where fibers connect the brain's left and right hemispheres, thickens in adolescence.C. by the end of adolescence, individuals have fewer, less selective, less effective neuronal connections than they did as children.D. the amygdala—the seat of emotions such as anger—matures earlier than the prefrontal cortex in adolescents.

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