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: Government is divided into ____ basic functions.\Question: Choose the right answer from options given a) three b) no c) two d) four
Example Output: c

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: Young rats reach reproductive maturity in about ____ months.\Question: Choose the right answer from options given a) seven b) three c) two d) six
Example Output:
b