Answer : The correct option is, (A) thermal
Explanation :
Solar cell is a type of electrical device or p-n junction that converts the light or thermal energy directly into the electrical energy by using the photovalotic effect.
In the process of the energy conversion first require a material that absorbs the solar energy and raise the electron to the higher energy level and then flow of high energy electron to an external circuit. In this energy conversion, the silicon material is used.
Hence, the solar cells convert thermal energy into electrical energy.