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: Most gerbils live three to ____ years and have few health problems.\Question: Choose the right answer from options given a) three b) four c) seven d) zero

A: b
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Q: Acoustic guitars come in ____ types.\Question: Choose the right answer from options given a) two b) ten c) one d) four

A: a
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Q: Breast milk is the preferred food for an infant for the first four to ____ months.\Question: Choose the right answer from options given a) seven b) two c) three d) six

A:
d
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