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]: Poles CAN occur at ____ frequency.\Question: Choose the right answer from options given a) six b) four c) zero d) eight
[EX A]: c

[EX Q]: Corn borers complete at least ____ generations each summer.\Question: Choose the right answer from options given a) zero b) three c) two d) ten
[EX A]: c

[EX Q]: Centipedes undergo an incomplete metamorphosis , with ____ life stages.\Question: Choose the right answer from options given a) three b) four c) one d) zero
[EX A]:
a