Task: Question Answering
Input (English): Question: The volume of a cistern is 840 cubic meters and water is flowing into the cistern. If the surface level of the water is rising at the rate of 0.5 meters per minute, what is the rate, in cubic meters per minutes, at which the water is flowing into the cistern?

 Option A: 0.125

 Option B: 0.25

 Option C: 0.5

 Option D: 0.75

 Option E: Not enough information to determine the rate
Output (English): Option E