Question

Which best describes the European Union?

an economic policy that places tariffs on goods entering Europe
a trade agreement responsible for one of the world’s largest economies
an economic policy that lowers tariffs on goods sent from Europe to the United States
a trade agreement that unites all European countries with a single trading goal

Answer 1

"a trade agreement responsible for one of the world’s largest economies"

More precisely, the European Union is a political and economic union of many European countries that creates a single market and together forms one of the world’s largest economies (so this option is the closest of the four).