The correct answer to this question is C, Potential energy stored in a battery. Voltage is always a measurement between two points. These points are the positive and negative ends of a battery.
It can also be measured between a wire and a ground. The measurement of voltage is in volts. To mathematically calculate voltage, the following equation can be done: V=IR. I stand for current, and R stands for resistance.
When they are multiplied together, that is how the voltage can be found. There are two types of voltage. The first is DC voltage, which stands for direct current voltage. The second is the AC voltage, which stands for Alternating Current-voltage.