Suppose the economy has just entered a downturn due to a decrease in investment

spending. While of the following actions could a central bank take to successfully counteract the

downturn?

a$)$ Increase capital investment spending on the part of government agencies.

b$)$ Issue treasury bills in order to lower the interest rate.

c$)$ Buy back treasury bills in order to lower the interest rate.

d$)$ Buy back treasury bills in order to raise the interest rate.

e$)$ Lower the tax rate on real estate and capital gains assets