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: Cats have ____ toes on their front paws, but only four touch the ground when walking.\Question: Choose the right answer from options given a) six b) nine c) five d) zero
Example Output: c

Example Input: Right whales are slow swimmers, averaging just ____ miles per hour.\Question: Choose the right answer from options given a) nine b) six c) two d) five
Example Output: b

Example Input: Modern gymnosperms are classified into ____ phyla.\Question: Choose the right answer from options given a) four b) zero c) five d) three
Example Output:
a