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


[Q]: Real airplanes have round engines and ____ wings.\Question: Choose the right answer from options given a) four b) six c) three d) two
[A]: d


[Q]: Men are ____ times more likely to get bladder cancer than women.\Question: Choose the right answer from options given a) three b) zero c) five d) ten
[A]:
a