Concept:Physical measures are direct government actions that restrict imports without relying on taxes or prices.
Explanation:Foreign exchange control allows the government to restrict or ban the purchase of foreign currency.
Importers need foreign exchange to pay for goods from other countries.
When access to foreign exchange is limited, importers cannot complete international transactions.
As a result, the volume of imports falls.
This is a physical or administrative measure, not a fiscal or monetary incentive.
Answer:C. use of foreign exchange control