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: Children of alcoholics are ____ times more likely than other people to become alcoholics themselves.\Question: Choose the right answer from options given a) zero b) four c) nine d) two
Example Output: b

Example Input: Classes play ____ distinct roles in object-oriented programming.\Question: Choose the right answer from options given a) eight b) zero c) two d) no
Example Output: c

Example Input: Sexual maturity is reached between the ages of ____ and thirteen.\Question: Choose the right answer from options given a) one b) eight c) six d) zero
Example Output:
b