Task: Question Answering
Input (English): Question: A and B have the same number of marbles when they start playing. After some time A gains 20 marbles and later he loses 2/3rds of what he had. Now B has 4 times as many marbles as A has. What are the initial number of marbles that each of them had?

 Option A: 80

 Option B: 90

 Option C: 100

 Option D: 110

 Option E: 120
Output (English): Option C