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]: Microwave ovens emit ____ kinds of radiation.\Question: Choose the right answer from options given a) six b) two c) four d) eight
[A]: b


[Q]: Pelicans use ____ different ways to feed.\Question: Choose the right answer from options given a) no b) nine c) one d) two
[A]: d


[Q]: Sodium chloride is used for ____ reasons.\Question: Choose the right answer from options given a) seven b) nine c) six d) three
[A]:
d