Which of the following is a type of heat transfer?

Conduction is a type of heat transfer that occurs when heat moves through a substance from one part of that substance to another without the movement of the substance itself. This transfer happens at the molecular level, where faster-moving molecules collide with slower-moving ones, effectively transferring heat energy. Conduction is commonly observed in solids, particularly when they are in direct contact with each other; an example would be a metal spoon heating up when placed in a hot pot of soup.

Friction, on the other hand, is the resistance that one surface or object encounters when moving over another; it does not describe a method of heat transfer but rather can generate heat as a byproduct of movement.

Evaporation is a process in which molecules at the surface of a liquid gain enough energy to become gas. While this does involve heat, it primarily describes a phase change rather than a direct method of heat transfer between substances.

The additional choice combining conduction and evaporation, while both processes involve heat in some form, does not accurately represent a single type of heat transfer since they operate under different principles and contexts. Hence, focusing on conduction as a standalone type of heat transfer is the most accurate response.