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').

Ex 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

Ex Output:
c


Ex Input:
Many animals use two or ____ forest structure types.\Question: Choose the right answer from options given a) eight b) zero c) two d) three

Ex Output:
d


Ex Input:
Ospreys begin breeding at ____ or more years.\Question: Choose the right answer from options given a) one b) two c) three d) no

Ex Output:

c