Answer:
b. radiation
Explanation:
The correct choice is
b. radiation
Radiation is the process of heat transfer where no medium is required. Air is present between hands and flame and thermal conductivity of air is very low.
The hands are not in direct contact with the flame, hence conduction process of heat transfer is not possible.
In convection process of heat transfer, we have the warmer part of the medium moving towards the colder part. hence the convection is also not responsible for transfer of heat in this scenario
