Answer:
C) over-the-counter markets
Step-by-step explanation:
An over-the-counter (OTC) market is a market where traders buy and sell stocks, commodities, currencies, etc., directly between two parties. They are smaller markets that do not have a physical location (electronic trading only) and many times includes stocks whose prices are relatively low, e.g. Best Market (OTCQX), Venture Market (OTCQB). Transactions are generally carried out without brokers.