Which of the Following Does NOT Provide an Example of How

Which of the following does NOT provide an example of how Pavlov's principles can influence human health and well-being?

A) Former drug users often feel a craving when they are again in the drug-using context.
B) Children can learn health-related behaviors by observing their parents.
C) The association between consuming sugary substances and an enjoyable sensation makes dieting difficult.
D) When a taste accompanies a drug that influences immune responses,the taste by itself can come to also influence immune responses.