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: Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no
Example Output: a

Example Input: Black people are four to ____ times more likely to be stopped and searched.\Question: Choose the right answer from options given a) three b) five c) one d) four
Example Output: b

Example Input: Boolean logic uses ____ basic 'operators' or limiters to manipulate sets.\Question: Choose the right answer from options given a) eight b) six c) three d) nine
Example Output:
c