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When you make a chart, there are 2 important things to remember:

First, when you use colors in charts, always remember that some people are colorblind and will not be able to see the information you are presenting.

Second, make sure that the colors in your chart help people understand your chart. Even people who are not colorblind may not understand clearly what you are trying to show them.

Look at the chart below and then answer the question.

People who are colorblind see the number '2' in circle d, but nothing in a, b, or c. If you are not colorblind, what number do you see in circle d?

Choose only the number you see: 

20

8

6

5