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: Perennial grass takes ____ to five years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) six b) zero c) three d) no
Example Output: c

Example Input: Polyester has ____ favorable properties.\Question: Choose the right answer from options given a) four b) two c) seven d) six
Example Output: b

Example Input: Most vegetable seeds remain viable for ____ to five years when stored properly.\Question: Choose the right answer from options given a) two b) nine c) three d) five
Example Output:
c