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 the sentences grammatically correct.

a. (A)Because intelligence appears to have several (B)attention, the question of intellectual (C)declines is (D)typical.

b. (E)Researchers have generally paid more (F)components to the life-threatening diseases experienced by men than to the less (G)fatal but chronic diseases (H)complex of women.