Answer:C. is a downward sloping function of the interest rate.
Explanation: The demand for money is a downward sloping function of the interest rate, it means that the higher the interest rates on bonds and other alternative investments, will cause
people want to hold less of their wealth in the form of money. This goes ahead to show that if the chance is available for higher interest rate in certain kinds of investment,people will not be ready or they will lose interest in keeping money in the form of cash,they will rather keep them in other forms like bonds and other marketable securities.