You will be given a definition of a task first, then some input of the task.
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').

Reds can benefit from seven to ____ years' aging .\Question: Choose the right answer from options given a) ten b) eight c) four d) nine
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
d