ANS:B - between two bodies not in physical contact with each other.

Heat transfer by conduction occurs due to the transfer of kinetic energy and vibrational energy from one molecule to another within a substance. Conduction can take place within a single body or between two bodies in physical contact with each other. Therefore, the correct option is: from one part of a body to another part of the same body. Heat transfer by conduction can occur within the same body, transferring thermal energy from one region to another. The options 'b' and 'c' are incorrect. Heat transfer by conduction can occur both between two bodies in physical contact with each other and within the same body.