A foreign exchange market deals in

A foreign exchange market is a market where currencies from different countries are bought and sold. It is a global decentralized market that determines the exchange rate between different currencies. Individuals, companies, and governments participate in the foreign exchange market to buy and sell currencies for various reasons, such as trade, investment, tourism, or speculation. The exchange rate is determined by the supply and demand of each currency in the market. Therefore, the correct option is "currencies".