Final answer:
The World Trade Organization (WTO) is an established permanent institution that represents countries responsible for less than 1/4 of all world trade. The WTO also decides trade disputes between members.
Step-by-step explanation:
The World Trade Organization (WTO) is an established permanent institution rather than simply an agreement. It was formed in 1995 to supervise and liberalize international trade. The WTO represents countries responsible for less than 1/4 of all world trade, so statement A is true. Additionally, the WTO decides trade disputes between members, so statement C is also true.