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Answer:
C. the vertical scale.
Step-by-step explanation:
A "frequency bar chart" can be turned into a "relative frequency bar chart" by adjusting the vertical scale so that the total of heights of all bars is exactly 1. That is, the only necessary difference is the vertical scale.
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Additional comment
We assume that suitable classes have already been determined.
For example, the attached bar chart can be made a relative frequency bar chart by dividing the vertical scale by 36 (the total number of cars).
On the other hand, if the relative frequency of interest is the relative number of black or white cars, then the classes might need to be changed to combine the black and white classes into the one of interest.
