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').

Input: Consider Input: Respiratory therapists complete two to ____ years of education.\Question: Choose the right answer from options given a) no b) one c) four d) eight

Output: c


Input: Consider Input: Cows have four stomachs, and the first ____ yield merchantable tripe.\Question: Choose the right answer from options given a) two b) five c) zero d) three

Output: d


Input: Consider Input: Ethics Know the ____ models of ethical decision-making and how they help guide ethical decisions.\Question: Choose the right answer from options given a) six b) four c) nine d) no


Output: b