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]: Centrifugal pumps can usually handle up to about ____ percent by volume of air.\Question: Choose the right answer from options given a) one b) five c) eight d) seven
[A]: b


[Q]: Facial features are smooth and very ____ dimensional.\Question: Choose the right answer from options given a) zero b) four c) ten d) three
[A]: d


[Q]: Healthy people recover rapidly in ____ to five days.\Question: Choose the right answer from options given a) two b) eight c) nine d) seven
[A]:
a