When you are sitting a few feet from a fire, your skin feels warm. what forms of heat transfer are acting to transfer heat from the fire to your skin?

Radiation. Radiation refers to the emission of energy in rays or waves.  Heat moves through space as energy waves.  It is the type of heat one feels when sitting in front of a fireplace or around a campfire.  It travels in straight lines at the speed of light.  This is the reason that when facing the fire, only the front is warmed.  The backside is not warmed until the person turns around.

It is d, all the other ones say incorrect answer .