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').

Q: Calves are completely nutritionally dependent on their mothers to ____ months old.\Question: Choose the right answer from options given a) three b) zero c) five d) no

A: a
****
Q: Nematodes occur in ____ general forms.\Question: Choose the right answer from options given a) nine b) two c) seven d) ten

A: b
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Q: Mothers carry infants constantly their first ____ weeks.\Question: Choose the right answer from options given a) five b) one c) three d) eight

A:
c
****