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]: Digital bandwidth enables signal to be condensed as a five to ____ ratio.\Question: Choose the right answer from options given a) one b) nine c) seven d) six
[EX A]: a

[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]: Molecules are groups of ____ or more atoms.\Question: Choose the right answer from options given a) zero b) one c) nine d) two
[EX A]:
d