* Condensation is the process where a gas (like water vapor) changes into a liquid (like water droplets). This process releases thermal energy (heat) into the surroundings.

Let's look at the other options:

* Melting is the process where a solid changes into a liquid. This requires thermal energy to break the bonds holding the solid together.

* Sublimation is the process where a solid changes directly into a gas. This also requires thermal energy.

* Evaporation is the process where a liquid changes into a gas. This process requires thermal energy to overcome the intermolecular forces holding the liquid together.

In summary: Condensation is the only process listed that releases thermal energy.