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]: Hamsters can live to be three to ____ years old.\Question: Choose the right answer from options given a) four b) two c) three d) nine
[A]: a


[Q]: Butterflies have ____ stages in their life cycle.\Question: Choose the right answer from options given a) two b) four c) no d) eight
[A]: b


[Q]: Some people say there are ____ atheists in trench warfare.\Question: Choose the right answer from options given a) six b) ten c) no d) eight
[A]:
c