The answer is D).

A particular change represents a movement along the demand curve is the change is related to the price of the good. If a factor other than the price of a good affects the quantity demanded for the good, then there is a shift of the demand curve.

In this question, market interest rate is the rental price of capital. Therefore, when there is an increase in the market interest rate, we know that there will be a movement along the demand curve. Since the quantity demanded for capital declines with the rental price of capital (i.e., interest rate), an increase in market interest rate will reduce the quantity demanded for capital. Thus, there is a downward movement along the demand curve.