Answer :
Heat can be transferred in three ways: by conduction, convection, and by radiation. Only conduction is on the options so it would be A
A. Conduction
Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.