Which demonstrates conduction?

a marshmallow held over a fire
ice cream melting in the sun
cool feet walking across a hot pavement
a bulb releasing light energy

The right option is; cool feet walking across a hot pavement

Conduction is the conveying of energy in the form of heat or electricity through an object by direct contact. Conduction takes place in solids, liquids, and gases. Conduction of heat takes place when the temperature of molecules is increased. There is movement and vibration of the molecules which transfer the heat energy to the molecules around it. Examples of this are; cool feet walking across a hot pavement (given in the question), and touching a hot object by accident. The other form of conduction is that of electricity which occurs when electrically charged particles move through a medium.