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: Most internal parasites are specific to one or ____ species.\Question: Choose the right answer from options given a) seven b) three c) two d) five
Example Output: c

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: Whales are divided into ____ categories, based on their teeth.\Question: Choose the right answer from options given a) two b) four c) nine d) ten
Example Output:
a