Classical Conditioning Has Been Used to Curtail Coyote Attacks on Sheep

Multiple Choice

Classical conditioning has been used to curtail coyote attacks on sheep. Fresh mutton is tainted with a poison that causes dizziness and nausea. After a while, just the smell of sheep sends the coyotes running away. In this example, what is the CS?

A) poison
B) mutton
C) dizziness and nausea
D) smell of sheep