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]: 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
[A]: a


[Q]: Grasshoppers can fly at speeds up to ____ miles per hour.\Question: Choose the right answer from options given a) eight b) seven c) two d) nine
[A]: a


[Q]: Most trilliums have three, five or ____ petals and are white, pink or red.\Question: Choose the right answer from options given a) six b) five c) three d) no
[A]:
a