Is the direct transfer of heat between objects that touch. * conduction radiation or convection

The answer to this question is conduction!

Conduction is heat shared by two objects touching, an example would be a pot on a hot plate. The heat goes through the burner into the pot!

Conduction process of heat conduction. For example, A cold cast iron skillet is placed onto a stovetop. When the stove is turned on, the skillet becomes very hot due to the conduction of heat from the burner to the skillet.

Pretty sure it's d. heterogeneous is separated by physical properties.