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: Cats can harbor a heartworm infection at any age from ____ months to seventeen years.\Question: Choose the right answer from options given a) one b) six c) nine d) three

Output: c


Input: Consider Input: Embrasures have ____ functions.\Question: Choose the right answer from options given a) three b) seven c) zero d) nine

Output: a


Input: Consider Input: Nuclear transfer involves the use of ____ cells.\Question: Choose the right answer from options given a) two b) seven c) one d) six


Output: a