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: Nymphs emerge in ____ to seven days and flatten themselves against the leaf to feed.\Question: Choose the right answer from options given a) one b) five c) nine d) two

A: b
****
Q: Unequal cleavage can occur in ____ ways.\Question: Choose the right answer from options given a) two b) seven c) three d) ten

A: a
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Q: Rats deprived of all sleep stages live only about ____ weeks.\Question: Choose the right answer from options given a) eight b) three c) one d) five

A:
b
****