Q5 explanation

Option A: ggplot(diamonds, aes(carat, price))+stat_smooth(geom="line",color="blue")

Option B: ggplot(diamonds, aes(carat,price))+geom_smooth(stat="summary")

Option C: ggplot(diamonds, aes(carat, price))+geom_smooth(stat="smooth")

Option D: ggplot(diamonds, aes(carat, price))+stat_smooth(geom="point", level=0, color="blue")