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]: Hypertension affects nearly one in ____ adults.\Question: Choose the right answer from options given a) three b) seven c) five d) zero
[A]: a


[Q]: Reverse osmosis uses ____ to ten gallons of water to produce one gallon of drinking water.\Question: Choose the right answer from options given a) two b) zero c) five d) three
[A]: d


[Q]: Sexual maturity occurs in females when ____ or four years old and in males at five years.\Question: Choose the right answer from options given a) six b) zero c) five d) three
[A]:
d