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]: Voles are prolific breeders and can produce four to ____ litters a year.\Question: Choose the right answer from options given a) four b) two c) six d) three
[A]: c


[Q]: Many animals use two or ____ forest structure types.\Question: Choose the right answer from options given a) eight b) zero c) two d) three
[A]: d


[Q]: Some homes have ____ or even four computers from which they can access the Internet.\Question: Choose the right answer from options given a) seven b) five c) three d) ten
[A]:
c