According to the liquidity premium theory of interest rates, Tell me the letter of the correct answer to the question below AND tell me why the other answers are incorrect.

* According to the liquidity premium theory of interest rates, *

A. Long term spot rates are totally unrelated to expectations of future short-term rates.

B.Long-term spot rates are higher than the average of current and expected future short-term rates.

C.Investors are indifferent between different maturities if the long-term spot rates are equal to the average of current and expected future short-term rates.

D. Investors prefer certain maturities and will not normally switch out of those maturities

E. The term structure must always be upward sloping