The correct option is D Something for something
Quid pro quo is a Latin phrase used in English to mean an exchange of goods or services, in which one transfer is contingent upon the other. It indicates that an item or a service has been traded in return for something of value, usually when the propriety or equity of the transaction is in question. A contract must involve consideration: that is, the exchange of something of value for something else of value. For example, when buying an item of clothing or a gallon of milk, a predetermined amount of money is exchanged for the product the customer is purchasing; therefore, they have received something but have given up something of equal value in return. In simpler terms it is a type of barter system.