Answer: Option (b) is the correct answer.
Step-by-step explanation:
Thermal energy is defined as the energy present within a system due to the kinetic energy of its particles.
So, when heat is transferred from a hotter body to a colder body then thermal energy of hotter body will be absorbed by colder body. This will lead to increase in average kinetic energy of colder body until a thermal equilibrium is maintained between both the bodies.
Hence, we can conclude that when heat transfer between a hotter body and a colder body then thermal energy is absorbed by the colder body and the average kinetic energy of its particles increases.