The united states decides it wants to encourage citizens to buy televisions that are made in america, so it decides to set a limit on the number of televisions that can be imported from china and japan. this limit is an example of a

a. tariff
b. free trade agreement
c. trade union
d. quota

That would be a quota :)

D) Quota

Explanation:

A. tariff, is not your answer, for tariff is a tax on imports, rather than a limitation of imports.

B. free trade agreement, is not your answer, for free trade agreement states that there will be no tariff's imposed on the agreeing countries.

C. trade union, is not your answer, for that is an organization for workers in a particular trade that fights for better benefits such as higher pay, better working conditions, and lower hours to work per week.

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ok, but what is your question? as soon as you tell me i will answer your question : )