Which of the following is an example of stage 4 of classical conditioning?
A) A bell rung in front of the dog initially elicits no response.
B) A food bowl placed in front of a dog naturally elicits its drool.
C) A bell rung in front of the dog elicits drool.
D) A bell rung while a food bowl is simultaneously placed in front of the dog elicits drool.
