In 2000, 87 percent of the wild rat populations in Stadtlohn, Germany, was resistant to the poison bromadiolone. This indicates that ____was/were commonly used as rat poison(s) here, and the rat's resistance is an example of ____ selection.
A) warfarin; directional B) bromadiolone; directional C) both warfarin and bromadiolone; disruptive D) neither warfarin nor bromadiolone; stabilizing E) bromadiolone; disruptive