Answer: D)Their function is to assist in balancing trade between partner nations.
Explanation: As their names suggest, APEC ( Asian Pacific ECONOMIC COOPERATION) helps facilitate economic cooperation, the WTO (World TRADE Organization) helps coordinate trade and NAFTA (North American Free TRADE AGREEMENT) assists in trading between Canada, Mexico and the US. In other words, they function to "assist in balancing trade between partner nations".
The allies instead of providing a peace settlement based on the 14 point plan as Germany had though instead made the treaty very humiliating with the aim of keeping the Germans down. (C)