Concept:The forum for buying and selling securities of small and medium companies is the Second-Tier Securities Market.Explanation:The main stock market has strict requirements for listing securities.Many small and medium companies cannot meet those requirements.So, the Stock Exchange created a separate market in Lagos in 1985.It is known as the Second-Tier Securities Market (SSM).This market allows smaller companies to raise funds by selling shares.Answer:B. Second tier Security Market