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').

Input: Consider Input: Wolverines reproduce every ____ or three years.\Question: Choose the right answer from options given a) two b) three c) one d) four

Output: a


Input: Consider Input: Interdigital glands are present on all ____ feet, and are slightly larger on the front feet.\Question: Choose the right answer from options given a) three b) five c) four d) eight

Output: c


Input: Consider Input: Prairie dogs have only one litter of ____ pups a year.\Question: Choose the right answer from options given a) six b) seven c) zero d) five


Output: d