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]: Coccidiosis usually occurs from ____ weeks of age.\Question: Choose the right answer from options given a) zero b) no c) three d) eight
[EX A]: c

[EX Q]: National immunization vaccinates all children under ____ against polio.\Question: Choose the right answer from options given a) zero b) four c) ten d) five
[EX A]: b

[EX Q]: Unpolarized light is incident on ____ ideal polarizers in series.\Question: Choose the right answer from options given a) two b) three c) nine d) seven
[EX A]:
a