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').
--------
Question: 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

Answer: b


Question: Gasoline is ____ times as expensive as in the United States.\Question: Choose the right answer from options given a) two b) four c) three d) ten

Answer: c


Question: Human existence has ____ aspects - physical, mental and spiritual.\Question: Choose the right answer from options given a) three b) one c) no d) six

Answer:
a