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: Golden jackals live eight to ____ years in the wild and up to sixteen in captivity.\Question: Choose the right answer from options given a) no b) zero c) ten d) nine
Example Output: d

Example Input: Most people require roughly seven to ____ hours of sleep a night to stay alert through the day.\Question: Choose the right answer from options given a) eight b) ten c) one d) five
Example Output: a

Example Input: Breathing disorders are responsible for one in ____ deaths in the United States.\Question: Choose the right answer from options given a) eight b) six c) one d) seven
Example Output:
d