The correct answer is B. World Trade Organization.
Disputes which are solved mostly by world trade organization are about promises which are broken.
They solve their dispute by making sure that if a member who violates the rules of trade laws will settle the dispute by multilateral system instead of unilaterally way of action.
The main aim of world trade organization to make sure that global trade commences predictably, freely, and smoothly.
It also embodies and creates ground rules for global trade which is among nations.