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]: Females can only have four babies at ____ time.\Question: Choose the right answer from options given a) no b) one c) nine d) three
[EX A]: b

[EX Q]: Mares normally give birth to their first foal when they are between three and ____ years of.\Question: Choose the right answer from options given a) ten b) no c) six d) four
[EX A]: c

[EX Q]: Rabbits produce ____ types of feces.\Question: Choose the right answer from options given a) six b) no c) two d) one
[EX A]:
c