On a Coordinate Graph with Y on the Vertical Axis

On a coordinate graph with y on the vertical axis and x on the horizontal axis,suppose point A represents coordinates (X = 2,Y = 12) and point B represents coordinates (X = 6,Y = 4) .The slope of the straight line joining points A and B is

A) 5.
B) - .
C) .
D) -2.
E) 2.