Refer to the Graph, Which Shows the Import Demand and Export

Refer to the graph, which shows the import demand and export supply curves for two nations that produce a certain product. In this two-nation model, the equilibrium world price and quantity will be

A) A and $Q _ { 2 }$
B) B and $Q _ { 4 }$
C) C and $Q _ { 2 }$
D) D and $Q _ { 4 }$