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: Calves are born ____ and a half months after mating.\Question: Choose the right answer from options given a) six b) ten c) eight d) two
Example Output: c

Example Input: Oar boats are smaller than motor boats and can accommodate four to ____ people.\Question: Choose the right answer from options given a) zero b) three c) five d) no
Example Output: c

Example Input: Monotremes are the egg-laying mammals, and there are just ____ species.\Question: Choose the right answer from options given a) ten b) five c) three d) zero
Example Output:
c