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]: Heat pumps give off ____ fumes or harmful products of combustion.\Question: Choose the right answer from options given a) four b) zero c) six d) no
[EX A]: d

[EX Q]: Some species can make dives over ____ hundred feet deep.\Question: Choose the right answer from options given a) six b) eight c) two d) one
[EX A]: b

[EX Q]: Hickory is ____ counties north of Springfield.\Question: Choose the right answer from options given a) six b) no c) two d) five
[EX A]:
c