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: Nodes are points in space that have ____ probability for locating an electron there.\Question: Choose the right answer from options given a) no b) six c) zero d) three

A: c
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Q: Chickens take about six to ____ weeks to grow.\Question: Choose the right answer from options given a) eight b) two c) no d) five

A: a
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Q: All crabs have ____ pair of chelipeds and four pairs of walking legs .\Question: Choose the right answer from options given a) six b) ten c) five d) one

A:
d
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