In Assessing the Impact of Unionization on the Allocation of Labour

In assessing the impact of unionization on the allocation of labour within the labour market, the area under the labour demand curve equals:

A) the reduction in employment in the union sector.
B) the total loss of the output produced.
C) the gain in employment in the non-union sector.
D) the total value of the output produced.
E) the real resource losses.