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]: Traditional neon electrifies the inert gas from ____ directions.\Question: Choose the right answer from options given a) two b) nine c) one d) six
[EX A]: a

[EX Q]: Sexual reproduction involves ____ parents, one male and one female.\Question: Choose the right answer from options given a) zero b) two c) nine d) four
[EX A]: b

[EX Q]: Wolverines reproduce every ____ or three years .\Question: Choose the right answer from options given a) eight b) ten c) two d) one
[EX A]:
c