which demonstrates conduction?\no a marshmallow held over a fire\no ice cream melting in the sun\no cool…

Brief Explanations:

Conduction is the transfer of heat energy through direct contact. A marshmallow held over a fire is an example of radiation. Ice - cream melting in the sun is also due to radiation. A bulb releasing light energy is related to electrical - light energy conversion, not conduction. Cool feet walking across a hot pavement involves heat transfer from the hot pavement to the cool feet through direct contact, which is conduction.

Answer:

cool feet walking across a hot pavement