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]: Sound waves travel through the air in a similar manner, but in all ____ dimensions.\Question: Choose the right answer from options given a) three b) five c) nine d) one
[EX A]: a

[EX Q]: Bilingual teachers are more than people who speak ____ languages.\Question: Choose the right answer from options given a) five b) two c) three d) ten
[EX A]: b

[EX Q]: Saddle sores are a common problem after spending ____ and seven hours in the sweat and heat.\Question: Choose the right answer from options given a) six b) eight c) no d) zero
[EX A]:
a