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: Cleavage is good in ____ directions forming cubes.\Question: Choose the right answer from options given a) two b) three c) six d) zero
Example Output: b

Example Input: Some birds feed almost exclusively ____ feet or more above ground level on elevated feeders.\Question: Choose the right answer from options given a) one b) five c) four d) ten
Example Output:
c