[单选题]
A +3.0-C charge is at the origin and a +9.0-C chartskjaan) av+41)0 d t q2yy,qtge is at x =h pmgqk5.d1z, 4.0 m. Where on the x-axis can a third charge be placed s p .z15,kdghqmo 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