A 50 μC Charge Is Placed at the 0 Cm Mark

A 5.0 μC charge is placed at the 0 cm mark of a meter stick and a -4.0 μC charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field zero?

A) 1.4 m from the 0 cm mark
B) 2.5 m from the 0 cm mark
C) 2.9 m from the 0 cm mark
D) 3.3 m from the 0 cm mark
E) 4.7 m from the 0 cm mark