Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Example Input: Sexual maturity occurs at three to four years for females and ____ to five years for males.\Question: Choose the right answer from options given a) nine b) seven c) five d) four
Example Output: d

Example Input: All butterflies go through ____ life stages .\Question: Choose the right answer from options given a) one b) four c) zero d) five
Example Output: b

Example Input: Men are ____ times more likely than women to die of suicide.\Question: Choose the right answer from options given a) three b) four c) one d) five
Example Output:
b