Transferring a charge by touching is called charging by
Conduction
Explanation for Correct option:
Option (A): Conduction is the method of charge and energy transfer when two bodies are in contact with each other.
Explanation for Incorrect option:
Option (B): In this case, the charge is induced in the body, and no flow of charge occurs.
Option (C): Convection: In this case, particles move due to the difference in the temperature, and energy is also transferred with particles.
Option (D): It is the method in which energy is transferred by radiation or in the form of waves.
Hence, option (A) is correct.