Choose the word whose underlined part is pronounced differently

Choose the word whose underlined part is pronounced differently.
41(x). A. excuse B. example C. existence D. executive
42(a). A. apologize B. approach C. ancestor D. attention
43(e). A. decent B. argument C. marvelous D. compliment
44(k). A. kidding B. know C. knowledge D. knife
45(u). A. supportive B. maximum C. argument D. submit