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]: Astronauts sleep only ____ hours each night, on average.\Question: Choose the right answer from options given a) six b) one c) four d) seven
[A]: a


[Q]: Most people have ____ kidneys.\Question: Choose the right answer from options given a) two b) five c) seven d) six
[A]: a


[Q]: Fats consist of ____ major components.\Question: Choose the right answer from options given a) four b) seven c) two d) five
[A]:
c