Answer: Option (c) is the correct answer.
Step-by-step explanation:
When energy is transmitted or emission of energy through the space or in the form of waves then it is known as radiation.
Whereas in conduction and convection it is necessary that two objects should be touching each other in order to transfer heat.
Thus, we can conclude that a boy is sitting to the side of a campfire. He is 5 feet away, but still feels warm. This is an example of radiation.