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]: Hurricanes weaken rapidly when passing over land surfaces for ____ reasons.\Question: Choose the right answer from options given a) two b) three c) nine d) zero
[A]: b

[Q]: Natural indium contains ____ isotopes.\Question: Choose the right answer from options given a) one b) eight c) two d) seven
[A]: c

[Q]: Automatic weapons have ____ specific uses in military tactics.\Question: Choose the right answer from options given a) no b) nine c) two d) ten
[A]:
c