For a Monopsonist That Faces an Upward- Sloping Labour Supply

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