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]: Asthma accounts for ____ in six of all pediatric emergency visits in the United States.\Question: Choose the right answer from options given a) four b) seven c) one d) six
[A]: c


[Q]: Nymphs have eight instars requiring ____ years for the life cycle.\Question: Choose the right answer from options given a) seven b) nine c) three d) zero
[A]:
c