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: Minks travel more than most furbearers, covering up to ____ miles a night.\Question: Choose the right answer from options given a) four b) five c) zero d) ten
Example Output: 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: Cats can produce up to ____ litters a year from the age of one.\Question: Choose the right answer from options given a) three b) one c) eight d) four
Example Output:
a