The Figure Given Below Shows the Demand and Supply Curves

Multiple Choice

The figure given below shows the demand and supply curves of labor.A per-unit tax imposed on the wage income of the employees shifts the supply curve of labor upward.
-According to Figure 18-2,the proportion of the per-unit tax paid by the employers is:

A) OA/OB.
B) AB/AC.
C) BC/AC.
D) BC/AB.