Equal charges q are placed at x=0,2,4,8 m on x axis . Find the $\;|force|\;$ experienced by the charge at x=2 m

Question

$(a)\;\large\frac{kq^2}{4}\qquad(b)\;\large\frac{kq^2}{9}\qquad(c)\;\large\frac{kq^2}{36}\qquad(d)\;zero$