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: Trappers have ____ genders and reproduce sexually.\Question: Choose the right answer from options given a) zero b) two c) five d) one
Example Output: b

Example Input: Double price is based on two golfers sharing ____ room.\Question: Choose the right answer from options given a) one b) zero c) six d) nine
Example Output: a

Example Input: Wolverines reproduce every two or ____ years.\Question: Choose the right answer from options given a) zero b) three c) seven d) ten
Example Output:
b