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: Today there are ____ UK hospitals doing heart transplants.\Question: Choose the right answer from options given a) three b) five c) six d) nine
Example Output: d

Example Input: Foresters usually work ____ hours a day, five days a week.\Question: Choose the right answer from options given a) six b) five c) seven d) eight
Example Output: d

Example Input: Plants are ____ feet apart with ten feet between rows.\Question: Choose the right answer from options given a) ten b) seven c) four d) eight
Example Output:
c