We can actually deduce here that the purpose of the heading in this passage is: To distinguish who is telling the story.
Purpose of a passage simply refers to the objective or the goal that the writer of a passage is trying to achieve. The purpose of something helps one to know what he/she is looking for.
We can deduce that at the beginning of the passage, MARC was used to indicate the speaker. This means that Marc is the person telling the story.
Thus, we see here that the purpose is actually to distinguish who is telling the story.
Learn more about purpose of a passage on https://brainly.com/question/14648819
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