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]: Chemistry has ____ less important names.\Question: Choose the right answer from options given a) ten b) no c) eight d) nine
[A]: b


[Q]: Diarrheal disease kills ____ million children every year.\Question: Choose the right answer from options given a) three b) no c) four d) ten
[A]: a


[Q]: Milk teeth stay in a child up to the age of ____ to eight years.\Question: Choose the right answer from options given a) eight b) seven c) five d) six
[A]:
b