To a Monopsonist in a Labour Market,the Average Cost Curve

To a monopsonist in a labour market,the average cost curve of labour

A) lies above the supply curve of labour.
B) lies below the supply curve of labour.
C) is the supply curve of labour,which lies below the marginal cost curve for labour.
D) is the marginal cost curve of labour when the supply curve is upward sloping.
E) coincides with the marginal cost curve of labour only below the profit-maximizing wage rate.