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: 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: Breast cancer strikes one out of every ____ American women.\Question: Choose the right answer from options given a) one b) nine c) no d) six
Example Output: b

Example Input: Stillbirths can occur after heavy drinking in the last ____ months of pregnancy.\Question: Choose the right answer from options given a) six b) three c) four d) nine
Example Output:
b

