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: Owls have ____ toes on each foot, like most birds.\Question: Choose the right answer from options given a) no b) seven c) four d) one
Example Output: c

Example Input: Birds have ____ eyes.\Question: Choose the right answer from options given a) eight b) five c) nine d) two
Example Output: d

Example Input: Car crashes kill an average of ____ children each day.\Question: Choose the right answer from options given a) nine b) seven c) eight d) zero
Example Output:
b