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: Rabbits reach sexual maturity between three and ____ months of age.\Question: Choose the right answer from options given a) three b) seven c) six d) zero
Example Output: c

Example Input: Cyclic neutropenia tends to occur every three weeks and last ____ to six days at a time.\Question: Choose the right answer from options given a) six b) four c) five d) three
Example Output: d

Example Input: Most veterinarians suggest that cages are at least ____ feet in length.\Question: Choose the right answer from options given a) zero b) ten c) no d) three
Example Output:
d