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: Lines of force are ____ dimensional, surrounding a bar magnet on all sides.\Question: Choose the right answer from options given a) eight b) three c) zero d) no
Example Output: b

Example Input: Pelicans use ____ different ways to feed.\Question: Choose the right answer from options given a) no b) nine c) one d) two
Example Output: d

Example Input: Pups can hear and see well by the time they're ____ weeks old.\Question: Choose the right answer from options given a) no b) six c) three d) one
Example Output:
c