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]: Today there are ____ federal states, each based on cultural affiliations.\Question: Choose the right answer from options given a) one b) nine c) seven d) zero
[EX A]: b

[EX Q]: Vaccination typically occurs at ____ to eight weeks of age in kittens.\Question: Choose the right answer from options given a) three b) nine c) six d) no
[EX A]: c

[EX Q]: Insects have ____ body parts, a distinct head, thorax, and abdomen.\Question: Choose the right answer from options given a) five b) three c) six d) ten
[EX A]:
b