Suppose the Following Graph Shows the Potential Energy Function for a Certain

Suppose the following graph shows the potential energy function for a certain hypothetical interaction.

This interaction is

A) attractive for all $r$ .
B) repulsive for all $r$ .
C) attractive for small $r$ , but repulsive for large $r$ .
D) repulsive for small $r$ , but attractive for large $r$ .
E) impossible to characterize without more information.