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]: Military service is fulfilled by voluntary enlistment, generally for a period of ____ years.\Question: Choose the right answer from options given a) four b) one c) nine d) two
[EX A]: c

[EX Q]: Sexual maturity is reached at about ____ years of age.\Question: Choose the right answer from options given a) five b) ten c) no d) two
[EX A]: d

[EX Q]: Grown moose can swim ____ or ten miles.\Question: Choose the right answer from options given a) seven b) two c) ten d) five
[EX A]:
d