Interface features are regarded as a type of adhesion phenomenon and are often interpreted in terms

of the surface structure of the bonded material. Which are the major factors to be considered in explaining the adhesion phenomenon？

A．The color, surface electric resistance, free radical groups, and roughness of the material to be bonded

B．The weight, surface free energy, smell, and roughness of the material to be bonded

C．The wettability, surface free energy, polar groups, and roughness of the material to be bonded

D．The thickness, surface free energy, polar groups, and flatness of the material to be bonded