Concept:A trade association is a group of businesses in the same industry that unite to protect and promote their common interests.
Explanation:Trade associations mainly work for the welfare of their member businesses.
One of their key activities is organizing trade fairs and exhibitions.
These events help members display their products and attract potential customers.
This creates more business opportunities for all the member firms.
Option A is not correct because trade associations usually focus on domestic industry matters.
Option C is not an aim because ensuring quality goods and services is the responsibility of individual companies.
Option D is too vague and is not a specific aim of a trade association.
Therefore, among all the options, organizing trade fairs and exhibitions is a clear and direct aim of a trade association.
Answer:B. organize trade fairs and exhibitions