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: All quetzals have ____ legs.\Question: Choose the right answer from options given a) four b) zero c) eight d) ten

A: a
****
Q: Bytes are sets of ____ bits.\Question: Choose the right answer from options given a) four b) eight c) five d) ten

A: b
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Q: Vaporization can occur in temperatures as low as ____ degrees.\Question: Choose the right answer from options given a) one b) zero c) eight d) two

A:
b
****