Final answer:
The central bank cannot (a) lower taxes during a recession.
Step-by-step explanation:
The correct answer is (a) Lower taxes. When the economy is in a recession, the central bank can use various tools to stimulate the economy.
These tools include lowering the discount rate, lowering the funds rate, and buying securities.
However, lowering taxes is not a tool that the central bank directly controls.
It is typically a fiscal policy measure implemented by the government to stimulate economic activity during a recession.