Milgram includes the transcript of Gretchen Brandt's interaction to provide readers with an example of the kind of behavior he expected from the subjects of the experiment, as shown in option A.
We can arrive at this answer because:
Gretchen Brandt was one of the participants in the experiment and was uncomfortable with shocking a man with heart problems.
She asked the researcher to stop the text and when the researcher refused to stop she abandoned the experiment, as she did not want to be responsible for the man's suffering.
Milgram presented Gretchen Brandt's account in his article, as he believed that all participants would act this way, but he was mistaken.
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