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: Decapod crustaceans have ____ pairs of limbs.\Question: Choose the right answer from options given a) five b) four c) six d) seven
Example Output: a

Example Input: Molecules are ____ or more atoms stuck together.\Question: Choose the right answer from options given a) two b) zero c) six d) eight
Example Output: a

Example Input: Men kill and are killed four or ____ times more frequently than women.\Question: Choose the right answer from options given a) six b) nine c) seven d) five
Example Output:
d