(Choose 1 answer)
What step must you take before you can add the coord_polar() function to ggplot() to create a pie chart?
A. Add the geom_bar(position = "stack") command to the ggplot() function.
B. Add the geom_bar(position = "dodge") command to the ggplot() function.
C. Set the x argument of the aes() function used in the ggplot() function to the factor.
D. Add the geom_circle() command to the ggplot() function.
