4. Ella, Lance, Mikaela, and Zac were asked by their teacher to draw a spramogoh showing the obje's moving at a constant speed. The following illustrations below show their specimegons Who do you think among the four students got the correct answer? 1 Mikacia Zec A Miksela is correct because a line curving upwards shows a constant speed. B Ella is correct because a straight horizontal line above the rezis means that the speed is not changing over time, C.Zac is correct because a straight line going to the right indicates that the speed is not changing D. Lance is correct because a straight line going to the left indicates that the speed is the same over time​