Suppose You Are Shown Two Intersecting Demand Curves That Are

Suppose you are shown two intersecting demand curves that are drawn on the same scale. At the point of intersection, one of the demand curves is steeper than the other. Which of the following could explain the difference in slopes?

A) It is not possible to compare the slopes of different demand curves.
B) The flatter one is for a good with no close substitutes.
C) The steeper one has a higher income elasticity of demand.
D) The steeper one applies for the short run whereas the flatter one applies for the long run.
E) The steeper one is probably the demand curve for a luxury good.