The correct option is C)Warm air rises and takes heat with it;eventually it cools and sinks .
explanation:
There are three main ways in which heat can be transferred:
- Conduction
- Convection
- Radiation
Convection can be described as a process of heat transfer between areas having different temperatures . For example, cold air is more denser than warm air. This is the reason why conventional currents arise due to temperature gradient.