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: ATMs are expensive machines with an average useful life of ____ to fifteen years.\Question: Choose the right answer from options given a) nine b) eight c) ten d) two

Output: c


Input: Consider Input: Pluralism Comes in ____ forms.\Question: Choose the right answer from options given a) ten b) four c) six d) two

Output: d


Input: Consider Input: Viral croup is more common in children less than ____ years of age.\Question: Choose the right answer from options given a) five b) eight c) no d) zero


Output: a