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').

[EX 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
[EX A]: b

[EX Q]: Some species can make dives over ____ hundred feet deep.\Question: Choose the right answer from options given a) six b) eight c) two d) one
[EX A]: b

[EX Q]: Mongooses are mostly terrestrial, moving on all ____ limbs.\Question: Choose the right answer from options given a) ten b) five c) eight d) four
[EX A]:
d