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)​