The tiny South Pacific island country of Maroji produces a lot of milk and milk-based products. To protect this industry, Maroji mandates that only designated trading companies can import cheese, each of which is allocated the right to import a maximum number of pounds of cheese each year. By doing this, Maroji controls the amount of imported cheese. This is an example of a(n):.
a. import quota
b. import duty
c. import tariff
d. subsidy
e. local content requirement