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]: Marriage is the legal union of ____ people.\Question: Choose the right answer from options given a) one b) no c) five d) two
[EX A]: d

[EX Q]: Firebrat eggs hatch in about ____ weeks.\Question: Choose the right answer from options given a) ten b) one c) two d) no
[EX A]: c

[EX Q]: Most people spend ____ to eight years going to school acquiring skills so they can work.\Question: Choose the right answer from options given a) four b) five c) six d) nine
[EX A]:
a