For a Monopsonist That Faces an Upward-Sloping Labour Supply Curve

For a monopsonist that faces an upward-sloping labour supply curve, the marginal cost of labour curve will be
The supply curve because .

A) below; the increased wage necessary to attract an extra worker is paid to that worker alone
B) above; the increased wage necessary to attract an extra worker must be paid to everyone already employed
C) above; the average wage exceeds the marginal wage when the average wage is rising
D) the same as; the marginal cost of labour equals the average cost of labour
E) below; the extra labour supplied is less capable than previous units of labour supplied