Task: Question Answering
Input (English): Question: If 2/3 of the air in a tank is removed with each stroke of a vacuum pump, how many strokes does it take before less than 1% of the original amount of air in the tank remains?

 Option A:  2

 Option B:  3

 Option C:  4

 Option D:  5

 Option E:  6
Output (English): Option D