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: Cats have ____ sets of vocal cords.\Question: Choose the right answer from options given a) zero b) nine c) two d) three

A: c
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Q: All baleen whales have ____ blow holes.\Question: Choose the right answer from options given a) zero b) four c) seven d) two

A: d
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Q: Ants have ____ castes, the worker and the reproductive.\Question: Choose the right answer from options given a) eight b) two c) four d) five

A:
b
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