Final answer:
Dollar bills in the United States are an example of general-purpose money because they can be exchanged for a wide array of goods and services across the entirety of the country.
Step-by-step explanation:
General-purpose money is a medium of exchange used to transact for a wide array of goods and services within a society. The characteristic that sets general-purpose money apart is its wide acceptability. Examples of this type of money include dollars, euros, pesos, yen, and bitcoin, which can be used to buy a vast spectrum of items, from basic necessities to luxury goods.
On the other hand, special-purpose money is limited to specific transactions or occasions, such as bridal payments or in certain ceremonial contexts; it is not meant for general commerce. Looking at the student's choices, dollar bills in the United States fit the description of general-purpose money, as they are recognized and used across the country for exchanging a variety of goods and services.