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').

[EX 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
[EX A]: b

[EX Q]: Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four
[EX A]: b

[EX Q]: Federal law limits most adults to ____ years of benefits in a lifetime.\Question: Choose the right answer from options given a) eight b) six c) five d) one
[EX A]:
c