In ggplot2, how do you add a color gradient to a scatter plot based on a numeric variable color_var?
A. scale_fill_gradient(low = "blue", high = "red")
B. color_gradient(low = "blue", high = "red")
C. scale_color_gradient(low = "blue", high = "red")
D. geom_point(aes(color = color_var), fill = "blue")
Answer: Option C

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