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]: Some European countries require ____ years of education.\Question: Choose the right answer from options given a) no b) nine c) six d) three
[A]: d


[Q]: Corn borers complete at least ____ generations each summer.\Question: Choose the right answer from options given a) zero b) three c) two d) ten
[A]: c


[Q]: Fats consist of a glycerin molecule with ____ fatty acids attached.\Question: Choose the right answer from options given a) zero b) no c) eight d) three
[A]:
d