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').
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Question: 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

Answer: b

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

Answer: b

Question: Cold electricity presents a form of electric energy without electron flow, i.e. ____ current.\Question: Choose the right answer from options given a) ten b) zero c) five d) four

Answer:
b