It is going to be B. the word Bio means the earth. every time you hear the word Bio, then think about the earth
The thermal energy can be defined as the type of kinetic energy which is generated due to the motions of the particles. This motion generates a temperature which can be measured easily. The type of thermal energy which flows from one substance to another when the temperature of the two substances is different is known as heat.
Hence, the blank can be filled with 'heat'.
