On a Diagram with the Interest Rate on the Vertical

On a diagram with the interest rate on the vertical axis and the quantity of money demanded on the horizontal axis,how can the total demand for money be obtained?

A) By adding the transactions and the asset demand for money horizontally.
B) By subtracting the transactions demand from the asset demand for money vertically.
C) By subtracting the asset demand from the transactions demand for money horizontally.
D) By adding the transactions and the asset demand for money vertically.
E) The asset and transaction demands are unrelated and therefore cannot be added or subtracted.