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').

[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
[A]: b


[Q]: Western culture offers only ____ genders, man or woman.\Question: Choose the right answer from options given a) three b) two c) one d) four
[A]: b


[Q]: Human sperm comes in ____ varieties, mixed.\Question: Choose the right answer from options given a) one b) six c) three d) nine
[A]:
c