As part of the treatment strategy that Mary Cover Jones used, she had 3-year-old Peter:

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Mary Cover Jones used systematic desensitization, a behavior therapy technique that involves gradually introducing the feared object or situation in a controlled manner. Part of this technique involves the use of a hierarchy of increasingly anxiety-provoking stimuli. In the case of Peter and his fear of rabbits, observing other children holding and petting a tame rabbit would be a lower-level stimuli that would gradually help him overcome his fear. Therefore, choice D (observe other children holding and petting a tame rabbit) is the best option.

As Part of the Treatment Strategy That Mary Cover Jones