Concept:Trade associations promote and protect the interests of firms in a particular trade or industry.
Explanation:Trade associations help members by conducting research and development.
They also set product standards to ensure uniform quality.
They provide technical information and training to members.
However, providing credit facilities is not a normal function of a trade association.
Credit facilities are usually offered by banks and financial institutions.
Therefore, among the given options, credit facilities is the function not performed by a trade association.
Answer:C. credit facilities