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]: Children now account for only ____ percent of all forest fires caused in the United States.\Question: Choose the right answer from options given a) five b) four c) eight d) nine
[A]: b


[Q]: Many comets have ____ tails.\Question: Choose the right answer from options given a) two b) six c) three d) one
[A]: a


[Q]: Sea cucumbers can live up to ____ years.\Question: Choose the right answer from options given a) eight b) five c) no d) four
[A]:
a