Which of the Following Is a Reason Why It Takes

Which of the following is a reason why it takes middle-aged adults longer to perform cognitive tasks than younger adults?

A) It is more difficult for the middle-aged brain to activate large areas of the cortex.
B) A larger area of brain tissue is activated,so it takes longer to process information.
C) Because of decreased blood supply to the brain resulting from the build-up of plaque.
D) Because the middle-aged brain does not react to perceptual stimuli as fast as the young adult brain.