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]: Most children experience at least one episode by the time they are ____ years old.\Question: Choose the right answer from options given a) eight b) one c) ten d) seven
[A]: d


[Q]: Young children suffer from an average of six to ____ colds a year.\Question: Choose the right answer from options given a) ten b) eight c) two d) one
[A]: b


[Q]: Rock bass are small to medium sized sunfish, reaching ____ to ten inches in length.\Question: Choose the right answer from options given a) seven b) one c) six d) eight
[A]:
c