What Was the Primary Goal of the National Trade Associations

What was the primary goal of the national trade associations that Herbert Hoover supported during his presidential administration?

A) improving business efficiency by reducing competition
B) redistributing the concentrated wealth gained through trusts and holding companies to a greater number of businesses
C) cooperating with other business competitors so that they could lend Germany funds to stabilize its economy and pay war reparations
D) placing higher tariffs on farm products and manufactured goods to protect American farms and businesses from foreign competition