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: Influenza epidemics are ____ times more likely during solar maxima.\Question: Choose the right answer from options given a) ten b) eight c) no d) four
Example Output: d

Example Input: Traditional neon electrifies the inert gas from ____ directions.\Question: Choose the right answer from options given a) two b) nine c) one d) six
Example Output: a

Example Input: Acupuncture needles are about ____ to three inches long.\Question: Choose the right answer from options given a) nine b) two c) five d) seven
Example Output:
b