Right Before Baby Dom's Mother Leaves for Work Every Morning

Multiple Choice

Right before baby Dom's mother leaves for work every morning, she takes her car keys off of a hook on the wall. As soon as Dom's mother unhooks the keys, Dom cries. In this example, __________ is the conditioned stimulus.

A) Dom's mother leaving for work
B) Dom's mother unhooking the keys
C) Dom's crying
D) morning time