The term free trade can be best described as
a. the government promotion of private businesses.
b. full government control of imports and exports that. contribute to the nation s gdp.
c. trade without tariffs, quotas or other restrictions.
d. trade that occurs between imperial colonies.

The term free trade can be found for example in NAFTA: North American Free Trade Agreement: it's a trade without additional obstacles, which is thought to be beneficial for both parties.

So the correct answer is;
c. trade without tariffs, quotas or other restrictions.

So, because of NAFTA there are not tariffs between US and Mexico.

The answer to that would be prussia which would later be germany