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').

Example Input: China is reportedly in the top ____ nations in industrial output.\Question: Choose the right answer from options given a) seven b) ten c) three d) five
Example Output: b

Example Input: Women gain ____ years per child they had.\Question: Choose the right answer from options given a) ten b) nine c) four d) two
Example Output: d

Example Input: Equations are statements which say that ____ quantities are equal.\Question: Choose the right answer from options given a) ten b) one c) two d) nine
Example Output:
c