2. PART B: Which detail from the text best supports the answer to Part A?

A. "Less plastic than a child's developing brain, but not yet with all of the executive
functions of an adult noggin." (Paragraph 1)
B. "And that region is where the all-important executive function areas are forming for
teenagers: the frontal cortex." (Paragraph 2)
C. "To learn more, researchers recruited 96 male sports participants ages nine through 26
— half of whom had had a diagnosed concussion in the past year." (Paragraph 3)
D. "Using a battery of memory, attention, motor tests and EEG monitors, the researchers
found that all of the concussed athletes showed reduced working memory."
(Paragraph 3)