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: Most Trusts have ____ or more Trustees.\Question: Choose the right answer from options given a) zero b) nine c) ten d) two
Example Output: d

Example Input: Onion thrips experience ____ instars.\Question: Choose the right answer from options given a) three b) six c) eight d) four
Example Output: d

Example Input: Biologists use ____ characteristics to classify something as a living thing.\Question: Choose the right answer from options given a) seven b) no c) nine d) ten
Example Output:
a