A Tariff Differs from a Quota in That a Tariff

A tariff differs from a quota in that a tariff is:

A) a tax imposed on imports, whereas a quota is an absolute limit to the number of units of a good that can be imported.
B) a tax levied on exports, whereas a quota is a limit on the number of units of a good that can be exported.
C) levied on exports, whereas a quota is imposed on imports.
D) levied on imports, whereas a quota is imposed on exports.