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: All mass spectrometers consist of ____ distinct regions.\Question: Choose the right answer from options given a) three b) one c) two d) zero
Example Output: a

Example Input: Bytes are sets of ____ bits.\Question: Choose the right answer from options given a) four b) eight c) five d) ten
Example Output: b

Example Input: Children are ____ times more likely to commit suicide.\Question: Choose the right answer from options given a) six b) three c) ten d) one
Example Output:
a