The correct answer is A. Heat.
Heat is the flow of thermal energy. It is a form of energy that is transferred between two objects that are at different temperatures. The object with the higher temperature will transfer
heat to the object with the lower temperature until the two objects reach the same temperature.Current is the flow of electric charge. It is measured in amperes (A). The current in a circuit is the rate at which electric charge flows through the circuit.
Voltage is the difference in electric potential between two points. It is measured in volts (V). The voltage in a circuit is the difference in electric potential between the two terminals of a power source.
Potential is the ability to do work. It is measured in joules (J). The potential energy of an object is the energy that it has due to its position or state.
In conclusion, the flow of thermal energy is called heat.