Concept:Heat from a charcoal fire reaches a person mainly through radiation, which transfers energy by electromagnetic waves without needing a medium.
Explanation:Radiation is the transfer of heat energy in the form of electromagnetic waves from a hot surface to a cooler surface.
This process does not require any material medium, so it can travel through air and even vacuum.
The charcoal fire emits a large amount of infrared radiation, which is absorbed by the skin and warms the body directly.
Conduction requires direct contact between objects, and air is a poor conductor.
Convection involves the movement of hot air or fluids rising and carrying heat upward, which is less significant for warming someone standing away from the fire.
Therefore, the occupant standing away from the fire is warmed mainly by radiation.
Answer:B. Radiation