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').

Input: Consider Input: Perennial grass takes ____ to five years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) six b) zero c) three d) no

Output: c


Input: Consider 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

Output: b


Input: Consider Input: Dholes are highly social animals and live in packs of about ____ dogs.\Question: Choose the right answer from options given a) one b) eight c) three d) ten


Output: d