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: Uncontrolled diabetes can increase risk by up to ____ times.\Question: Choose the right answer from options given a) five b) four c) seven d) eight
Example Output: b

Example Input: Women live an average of five to ____ years longer then men.\Question: Choose the right answer from options given a) one b) five c) ten d) seven
Example Output: d

Example Input: Starlings produce an average of ____ eggs in each clutch.\Question: Choose the right answer from options given a) eight b) seven c) ten d) five
Example Output:
d