In 2000, 87 Percent of the Wild Rat Populations in Stadtlohn

Multiple Choice

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