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: Springtails reproduce quickly usually within three to ____ weeks.\Question: Choose the right answer from options given a) five b) six c) nine d) three

A: a
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Q: Harbor porpoises live in groups averaging one to ____ individuals and are very skittish.\Question: Choose the right answer from options given a) seven b) five c) two d) three

A: d
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Q: Most mosquitoes live about ____ weeks, depending on the species.\Question: Choose the right answer from options given a) zero b) two c) ten d) three

A:
d
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