Directions: In the following question, two statements are given with some words in bold. Which of the following pairs of bold words must be interchanged to make both sentences grammatically correct?

a. Although the documentary was cognition(A), it failed to prevented(B) me or give me any new information(C).

b. In the car accident, Steve acquired(D) a head injury that affected his interesting(E) and enlighten(F) him from learning new things.