The Quantity of Loanable Funds Supplied Increases If the Real

The quantity of loanable funds supplied increases if the real interest rate rises, all other things remaining the same, because the

A) cost of living is determined by the real interest rate.
B) real interest rate is the opportunity cost of consumption.
C) demand for investment increases when the real interest rate rises.
D) real interest rate is the opportunity cost of saving.
E) real interest rate is inversely related to the cost of buying on credit.