When Sami Tried to Shape Her Pet Squirrel's Behavior to Fetch

Multiple Choice

When Sami tried to shape her pet squirrel's behavior to fetch marbles in the backyard, things proceeded quite smoothly at first. As time passed, however, the squirrel started burying the marbles rather than bringing them to her. This is an example of:

A) autoshaping.
B) instinctive drift.
C) negative automaintenance.
D) sign tracking.