Concept: A trade association is a body formed by people engaged in the same trade to protect and promote their common interests.Explanation:NURTW (National Union of Road Transport Workers) is an association of people in the road transport trade.ALGON is an association of local governments, NLC is a general labour congress, and NULGE is a union of local government employees.Therefore, the best example of a trade association is NURTW.Answer: C. NURTW