NEED HELP ASAP, WILL GIVE BRAINLIEST Which is an example of convection currents?

marshmallows toasting over a campfire
a pot being heated by an electric burner
feet getting hot when stepping across sand
a radiator emitting warm air and drawing in cool air

A radiator emitting warm air and drawing in cool air.

This is due to the warm air expanding and begins to rise as it is less dense. The cool air begins to "fall" as it is denser, drawing nearer to the radiator. The radiator will then heat the cool air and it will rise. The process then continues

It's D

Explanation:

Can't explain I'm taking a timed test(not including this question it wass related to what I looked up)

Byeee!

I hope this helped!