The scenario described indicates that medium brown fur provides a survival advantage due to better camouflage from predators, compared to light and dark brown fur. This is an example of disruptive selection, where individuals at both extremes (light and dark brown) are favored over the average (medium brown).
Thus, the distribution curve for the mouse population would look like two peaks at either end of the graph with a dip in the middle.
The correct response is:
disruptive; two peaks at either end of the graph with a dip in the middle.