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Answer (B) is correct . The OTC market is a dealer market, in which brokers and dealers are linked by telecommunications equipment. Securities not traded on the stock exchanges are traded in the OTC market. The dollar volume of trading is much greater on the stock exchanges than the OTC market because the largest companies are usually listed on the stock exchanges. However, the majority of all stocks are traded in the OTC market.

Answer (A) is incorrect because The OTC market is a dealer market that is connected by telecommunications equipment.
Answer (C) is incorrect because The OTC market is a dealer market that trades the majority of stocks.
Answer (D) is incorrect because The OTC market does not trade securities traded on the stock exchanges.