Australia and several other countries have free trade agreements. This means that they
A.
charge a tax on imported goods.
B.
are allowed to trade with each other.
C.
exchange goods without restrictions.
D.
ship goods between countries at no cost.
From Internet:
A Free trade Agreement (FTA) is an agreement between two or more countries where the countries agree on certain obligations that affect trade in goods and services, and protections for investors and intellectual property rights, among other topics. For the United States, the main goal of trade agreements is to reduce barriers to U.S. exports, protect U.S. interests competing abroad, and enhance the rule of law in the FTA partner country or countries.