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. What result would indicate that worldwide output is increased as a result of migration?

A) Area aced> area qsut.
B) Wage rates have increased in both countries.
C) Domestic output has increased in both countries.
D) The share of domestic output paid as business income increases in both countries.