Thermal energy is _______

The answer is None of these.

Explanation:-

• Thermal energy refers to the energy contained within a system that is responsible for its temperature.
• Heat is the flow of thermal energy.
• A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process 
• So, Thermal energy is not equal to the temperature of 1 Kelvin of water. Temperature is not the same thing as energy. Temperature is a measure of the average kinetic energy of the particles in a substance or system, whereas thermal energy indicates the total kinetic and potential energy of the particles in that system. While they are related, a temperature of 1 Kelvin does not give you information about the total thermal energy present, as energy calculations also consider factors like volume and type of substance.
• Thermal energy is not equal to 100 °C.
  This option is incorrect for reasons similar to the first one. 100 °C refers to a temperature, not an energy value. An object at 100 °C will have more thermal energy than the same object at a lower temperature, but the thermal energy of a substance is not dependent solely on its temperature. It also relies on the mass of the substance and its specific heat capacity.
• Thermal energy is not equal to the latent heat of vaporization absorbed by the body.
  The latent heat of vaporization refers to the amount of heat absorbed or released by a substance during the change of state from a liquid to a gas or vice versa at a constant temperature. While this process involves thermal energy, it is not synonymous with thermal energy, which includes all kinetic and potential energy of all the particles in a system.

Conclusion:-

So, the answer is None of These

NOTE:-  According to official answer key the answer is option 3 but according to question statement the answer will be option 4