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]: Atoms are extremely small, on the order of a few ____ billionths of a meter.\Question: Choose the right answer from options given a) ten b) seven c) nine d) eight
[EX A]: a

[EX Q]: Most bioluminescence is blue for ____ reasons.\Question: Choose the right answer from options given a) seven b) two c) four d) zero
[EX A]: b

[EX Q]: Boys are ____ times more likely to be abused outside of the family than girls.\Question: Choose the right answer from options given a) six b) four c) three d) nine
[EX A]:
b