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]: Rock cavies become sexually mature when they are about one to ____ months old.\Question: Choose the right answer from options given a) one b) four c) three d) seven
[A]: c


[Q]: Females reach sexual maturity around ____ to five year-olds.\Question: Choose the right answer from options given a) four b) five c) one d) ten
[A]: a


[Q]: Rabbits have ____ incisors in the upper jaw where rodents have only two.\Question: Choose the right answer from options given a) three b) two c) four d) nine
[A]:
c