Concept:Monetary policy is the central bank's tool for controlling money supply and credit in the economy.
Explanation:The central bank changes its bank rate to make borrowing expensive or cheap for commercial banks.
The bank rate is the interest the central bank charges commercial banks on loans and advances.
An increase in the bank rate reduces commercial banks' borrowing and lowers money supply.
A decrease in the bank rate encourages borrowing, increases credit, and expands money supply.
By using the bank rate in this way, the central bank regulates economic activity and controls inflation.
Among the options, the bank rate is the standard general instrument for carrying out monetary policy.
Answer:D. bank rates