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: Alcoholics are nearly ____ times more likely than others to die in motor vehicle crashes.\Question: Choose the right answer from options given a) ten b) eight c) six d) five
Example Output: d

Example Input: China has about ____ in four of all smokers in the world.\Question: Choose the right answer from options given a) one b) seven c) ten d) six
Example Output: a

Example Input: Nitrates are a health concern for infants under ____ months of age and pregnant women.\Question: Choose the right answer from options given a) zero b) nine c) six d) ten
Example Output:
c