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: Interpersonal conflict exists whenever ____ or more people disagree.\Question: Choose the right answer from options given a) five b) seven c) no d) two
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: Most affected piglets are only ____ to three days of age.\Question: Choose the right answer from options given a) eight b) five c) one d) nine
Example Output:
c