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').

[Q]: Scientists divide bats into ____ groups.\Question: Choose the right answer from options given a) five b) two c) one d) zero
[A]: b


[Q]: Humans learn through the ____ senses.\Question: Choose the right answer from options given a) eight b) one c) five d) ten
[A]: c


[Q]: Death can occur within ____ hours in children.\Question: Choose the right answer from options given a) zero b) four c) five d) one
[A]:
c