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: Brachiopods are superficially similar to bivalves, both having ____ shells.\Question: Choose the right answer from options given a) two b) eight c) seven d) one
Example Output: a

Example Input: Mountain goats have ____ sharp horns.\Question: Choose the right answer from options given a) two b) six c) ten d) four
Example Output: a

Example Input: Coyotes can often live ____ to eight years in the wild.\Question: Choose the right answer from options given a) one b) three c) six d) nine
Example Output:
c