For a nucleus${ }_{\mathrm{z}}^{\mathrm{A}}\mathrm{x}$ having mass number A and atomic number Z
A) The surface energy per nucleon $\left({\mathrm{b}}_{\mathrm{s}}\right)=-{\mathrm{\alpha }}_1{\mathrm{A}}^{2/3}$  
B) The Coulomb contribution to the binding energy ${\mathrm{b}}_{\mathrm{c}}=-{\mathrm{\alpha }}_2\frac{\mathrm{Z}(\mathrm{Z}-1)}{{\mathrm{A}}^{4/3}}$  
C) The volume energy ${\mathrm{b}}_{\mathrm{v}}={\mathrm{\alpha }}_3\mathrm{A}$  
D) Decrease in the binding energy is proportional to surface area.
E) While estimating the surface energy, it is assumed that each nucleon interacts with 12 nucleons. (${\mathrm{\alpha }}_1,{\mathrm{\alpha }}_2$ and ${\mathrm{\alpha }}_3$ are constants)
Choose the most appropriate answer from the options given below