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]: Vampires generally are male, and rabies is ____ times more frequent in men than in women.\Question: Choose the right answer from options given a) no b) two c) zero d) seven
[EX A]: d

[EX Q]: Chlorine is manufactured in ____ ways.\Question: Choose the right answer from options given a) four b) two c) nine d) seven
[EX A]: b

[EX Q]: Earthworms range in size from a few inches long to over ____ feet long.\Question: Choose the right answer from options given a) five b) one c) seven d) nine
[EX A]:
a