Concept:Countertrade is a form of international trade where payment is made by exchanging goods or services instead of using money.Explanation:In countertrade, goods are directly exchanged for other goods or services in the international market.No hard currency or money is involved in the transaction.This method is often used by countries with limited foreign exchange or credit facilities.It is commonly practised among developing countries.Therefore, the correct option is counter trade.Answer:C. counter trade