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: Some programming languages have ____ or more standards.\Question: Choose the right answer from options given a) no b) seven c) two d) three
Example Output: c

Example Input: Conflict diamonds account for less than ____ per cent of world trade in rough diamonds.\Question: Choose the right answer from options given a) two b) four c) one d) ten
Example Output: b

Example Input: Some species have ____ fingers per hand.\Question: Choose the right answer from options given a) nine b) ten c) four d) seven
Example Output:
b