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: Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four
Example Output: b

Example Input: Young children suffer from an average of six to ____ colds a year.\Question: Choose the right answer from options given a) ten b) eight c) two d) one
Example Output: b

Example Input: Pork is a key part of three of the top ____ fastest-growing meal segments in food service.\Question: Choose the right answer from options given a) zero b) nine c) one d) five
Example Output:
d