Concept:Trade associations are organisations formed by businesses in the same industry to protect and promote their common interests.
Explanation:One of the major functions of a trade association is to unite members so they can work together on shared goals.
This includes sharing information, setting common standards, and presenting a united voice to the government and the public.
By encouraging teamwork and mutual support, the association helps members solve common problems and improve their business environment.
Among the given options, this is best described as fostering cooperation among members.
Answer:D. foster cooperation among members.