If the Supply of Capital Is Perfectly Elastic,the Incidence of a Tax

If the supply of capital is perfectly elastic,the incidence of a tax on capital income is

A) paid entirely by the suppliers of capital.
B) paid entirely by firms that demand capital.
C) shared equally between firms that demand capital and the suppliers of capital.
D) shared but not equally between firms that demand capital and the suppliers of capital.
E) unknown.