A Simple Beam AB with an Overhang BC Is Loaded $8 \mathrm{kN} \cdot \mathrm{m}$

A simple beam AB with an overhang BC is loaded as shown in the figure. The bending moment at the midspan of AB is approximately: (A) $8 \mathrm{kN} \cdot \mathrm{m}$
(B) $12 \mathrm{kN} \cdot \mathrm{m}$
(C) $17 \mathrm{kN} \cdot \mathrm{m}$
(D) $21 \mathrm{kN} \cdot \mathrm{m}$