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: Real airplanes have round engines and ____ wings.\Question: Choose the right answer from options given a) four b) six c) three d) two

Output: d


Input: Consider Input: Chlorine gives vinyl ____ advantages.\Question: Choose the right answer from options given a) six b) four c) two d) ten

Output: c


Input: Consider Input: Some dedicated vegetarians have to spend ____ quarters of their waking hours foraging.\Question: Choose the right answer from options given a) two b) three c) four d) five


Output: b