In the Accompanying Graphs, the Pre-Migration Labor Force in Country

In the accompanying graphs, the pre-migration labor force in country A is 0d and in country B it is 0u. If business income is total output minus total labor cost, then business income in country B after emigration occurs

A) increases by area vqsw.
B) increases by area qsr.
C) decreases by area qsr.
D) decreases by area vqsw.