Task: Question Answering
Input (English): Question: When n liters of fuel was added to a tank that was already 2/3 full, the tank was filled to 7/9 of its capacity. In terms of n, what is the capacity of the tank, in liters?

 Option A: 10/9 n

 Option B: 4/3 n

 Option C: 3/2 n

 Option D: 9/4 n

 Option E: 9n
Output (English): Option E