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: Cats can harbor a heartworm infection at any age from ____ months to seventeen years.\Question: Choose the right answer from options given a) one b) six c) nine d) three
Example Output: c

Example Input: Reliability affects the production of goods in ____ distinct ways.\Question: Choose the right answer from options given a) one b) eight c) six d) three
Example Output: d

Example Input: Autism is a developmental disability that is ____ times more prevelant in males than females.\Question: Choose the right answer from options given a) three b) six c) five d) four
Example Output:
d