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: People can go without food for up to about ____ weeks.\Question: Choose the right answer from options given a) three b) one c) nine d) four
Example Output: a

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: Plums generally bloom and fruit in three to ____ years.\Question: Choose the right answer from options given a) five b) seven c) one d) no
Example Output:
a