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: Ossification begins up to ____ months before birth.\Question: Choose the right answer from options given a) nine b) seven c) three d) six

A: b
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Q: Selenium is ____ times more poisonous than arsenic.\Question: Choose the right answer from options given a) one b) five c) eight d) two

A: b
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Q: Baleen whales have two and toothed whales have ____ .\Question: Choose the right answer from options given a) five b) one c) nine d) two

A:
b
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