Which of these statements refers to convection?

question options:

some of this energy is reflected off earth's atmosphere.

sunlight travels through space without the aid of fluids or solids.

warm air rises and takes the heat with it; eventually, it cools and sinks.

land and ocean absorb and re-emit heat from the sun.

The correct answer is option C

The convection occurs because of the movement of lighter hot gas that rises up and the dense, cold air that stays below . Due to this heated air eventually replaces the colder air, gets cool down and sinks. This creates an on going process of warming, rising, cooling and then sinking causing the convection current.