Properties are not affected by changes in temperature and pressure

Latent heat

Explanation:

Properties that are not affected by the changes temperature pressure when the rise and fall of the air temperature and pressure at the surface of the solid object is its latent heat as it remains the same and does not change with energy given in it out. The energy equilibrium has thus to be maintained and only changes its form of matter from one place to another. Another property that does not change is the aspect ratio of the substance that is subject to heating and cooling at higher and lower temperatures and pressure.

The answer is a) carbon-12