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: Bulbs bloom four to ____ weeks after planting.\Question: Choose the right answer from options given a) seven b) one c) six d) nine
Example Output: c

Example Input: Hamsters can live to be three to ____ years old.\Question: Choose the right answer from options given a) four b) two c) three d) nine
Example Output: a

Example Input: Most vegetable seeds remain viable for three to ____ years when stored properly.\Question: Choose the right answer from options given a) five b) six c) three d) no
Example Output:
a