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: Woodchucks produce about ____ young and virtually all females breed annually.\Question: Choose the right answer from options given a) ten b) four c) no d) six

Output: b


Input: Consider Input: All birds have ____ legs with four toes each.\Question: Choose the right answer from options given a) zero b) one c) three d) two


Output: d