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: Vampires generally are male, and rabies is ____ times more frequent in men than in women.\Question: Choose the right answer from options given a) no b) two c) zero d) seven
Example Output: d

Example Input: Vision problems affect one in ____ school-aged children.\Question: Choose the right answer from options given a) six b) four c) seven d) one
Example Output: b

Example Input: Zinnias grow best in full sun, which means ____ or more hours of direct sun daily.\Question: Choose the right answer from options given a) seven b) six c) no d) nine
Example Output:
b