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: Vision problems affect one in ____ school-aged children.\Question: Choose the right answer from options given a) six b) four c) seven d) one

Output: b


Input: Consider Input: Youth unemployment is ____ times the adult level.\Question: Choose the right answer from options given a) one b) three c) seven d) no

Output: b


Input: Consider Input: Normal force is the force pressing ____ surfaces together.\Question: Choose the right answer from options given a) five b) four c) two d) eight


Output: c