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: Some European countries require ____ years of education.\Question: Choose the right answer from options given a) no b) nine c) six d) three

Output: d


Input: Consider Input: Trinity comes from tri-unity which means ____ in one.\Question: Choose the right answer from options given a) four b) three c) eight d) zero

Output: b


Input: Consider Input: Some places use only sand or ash and ____ chemicals at all.\Question: Choose the right answer from options given a) seven b) four c) no d) three


Output: c