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

In the accompanying graphs, the pre-migration labor force in country A is 100 and in country B it is 150. What part of domestic output in country A is the total wage bill before and after the immigration?

A) $500M before and $800M after
B) $500M before and $100M after
C) $400M before and $100M after
D) $400M before and $500M after