C$)$ increase; decrease; have no effect on; have an ambiguous effect on

D$)$ increase; decrease; have no effect on; decrease

E$)$ increase; increase; decrease; have an ambiguous effect on$10.$ The European Union's Common Agricultural Policy $($CAP$)$ is$,$ in effect

A$)$ a tariff imposed on agricultural exports.

B$)$ a tariff imposed on agricultural imports.

C$)$ a subsidy that reduces the cost of agricultural exports.

D$)$ a subsidy that increases the cost of agricultural exports.

E$)$ a quota that limits production of agricultural goods by EU nations.