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').

Example Input: 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
Example Output: b

Example Input: Sports bras come in ____ basic styles.\Question: Choose the right answer from options given a) five b) six c) two d) zero
Example Output: c

Example Input: Fathers invest in shoes for feet that mature in ____ weeks.\Question: Choose the right answer from options given a) zero b) five c) no d) six
Example Output:
d