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: Scientists divide bats into ____ groups.\Question: Choose the right answer from options given a) five b) two c) one d) zero

A: b
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Q: Ultrasonic liposuction fits into ____ categories.\Question: Choose the right answer from options given a) two b) seven c) nine d) one

A: a
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Q: Human malaria is caused by ____ species of Plasmodium.\Question: Choose the right answer from options given a) zero b) four c) seven d) one

A:
b
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