Final answer:
A proxy can differentiate a subject's chart from their own by making certain presentation choices.
Step-by-step explanation:
One way a proxy can differentiate a subject's chart from their own is by making certain presentation choices. For example, in a pie chart, the proxy can decide what categories should be used to produce the slices, thus making some slices appear bigger than others. Similarly, in a bar graph, the proxy can adjust the vertical axis to make variations in the height of the bars appear more or less pronounced.