I believe it is B. The purpose establishment of the League of Nations was to resolve international conflicts without war.
Choice A doesn't really make sense because neutral nations don't join war alliances; they remain neutral. Choice C and D actually would lead to more wars because Germany was bitter about being forced to accept the defeat. They further had to pay for the reparations, which wouldn't make anyone happy.
The Columbian Exchange or Grand Exchange, was the widespread, at the time, communicable diseases were a byproduct of the exchange.Slaves were a popular trade it em between Africa, Europe, and the American.
Its C. ending child labor, Hope This Helps!
