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 on the horizontal axis,how can the transactions demand for money be shown?

A) As a line parallel to the horizontal axis.
B) As a vertical line.
C) As a curve sloping downwards from left to right.
D) As a curve sloping upwards from left to right.
E) It cannot be shown on such a diagram.