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]: Mosquitoes spend one to ____ days in the pupae stage.\Question: Choose the right answer from options given a) zero b) two c) five d) three
[EX A]: b

[EX Q]: Earthworms have ____ pairs of hearts.\Question: Choose the right answer from options given a) seven b) five c) one d) no
[EX A]: b

[EX Q]: Atmospheric chemists come in ____ basic flavors.\Question: Choose the right answer from options given a) ten b) three c) one d) five
[EX A]:
b