[单选题]
A +3.0-C charge is at the origin and a wr 3)xxu *n0rsenj41y+9.0m 1sycytu9.0 x-C charge is at x = 4.0 m. Where on the x-axis can a third charge be placed syu0 t1 mcx9ys.o the net force on it is zero?
A. x = 0.50 m
B. x = 0.60 m
C. x = 1.5 m
D. x = 2.4 m