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]: 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]: 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
[EX A]: a

[EX Q]: Dogs have only ____ toes.\Question: Choose the right answer from options given a) no b) seven c) one d) four
[EX A]:
d