In the graph below, which line(s) represent(s) an object traveling with a constant acceleration? Velocity vs time graph. The x-axis is time and the y-axis is velocity. Line A extends from the upper left corner to the bottom right corner. Line B extends from the lower left corner to the upper right corner. Line C is a horizontal line. Line D extends from the bottom right corner, then to the right and up, but below line B. Group of answer choices Line A Lines B and D Lines A, B, and D Line C