Rina hustled through the classroom door, found her assigned seat, and sat down. after a few greetings to her friends, she unzipped her bulging binder and began to sort through its pages. she unearthed dog-eared worksheets, highlighted notes, and dated projects; alas, last night’s homework was not in the world history section where she had hoped it would be. as the bell rang, rina’s fruitless search continued.

based on the evidence provided, readers can conclude that rina is
a)unconcerned.
b)studious.
c)ambitious.
d)disorganized.

Why it's time to lay the stereotype of the 'teen brain’ to rest 2. part b: which detail from the text best supports the answer to part a? a “brain deficits don’t make teens do risky things; lack of experience and a drive to explore the world are the real factors.” (paragraph 1) b “according to this theory, the prefrontal cortex, the center of the brain’s cognitive-control system, matures more slowly than the limbic system, which governs desires and appetites including drives for food and sex.” (paragraph 5) c “in experiments that mimic the well-known marshmallow test, in which waiting for a bigger reward is a sign of self-control, adolescents are less impulsive than children and only slightly more so than adults.” (paragraph 12) d “the majority of adolescents do not die in car crashes, become victims of homicide or suicide, experience major depression, become addicted to drugs or contract sexually transmitted infections.” (paragraph 14)