Electric Field and Potential : the Graph in the Figure

Multiple Choice

Electric field and potential : The graph in the figure shows the variation of the electric potential V(x) (in arbitrary units) as a function of the position x (also in arbitrary units) . Which of the choices below correctly describes the orientation of the x-component of the electric field along the x-axis?

A) E_x is positive from x = -2 to x = 2.
B) E_x is positive from x = -2 to x = 0, and negative from x = 0 to x = 2.
C) E_x is negative from x = -2 to x = 0, and positive from x = 0 to x = 2.
D) E_x is negative from x = -2 to x = 2.