Answer the following question given this paragraph: 

Conduction is the transfer of thermal energy between particles of matter that are touching. Thermal conductors are materials that are good conductors of thermal energy. Thermal insulators are materials that are poor conductors of thermal energy. Both conductors and insulators have important uses.


Q: What is the transfer of thermal energy between particles of matter that are touching called?

 Choices:

- convection

- activation

- radiation

- conduction

A:
conduction
