A 100 NC Charge Is Placed on the X-Axis at X

A 1.00 nC charge is placed on the x-axis at x = −1.00 m. A second 1.00 nC charge is placed on the x-axis at x = 1.00 m. A third charge of 1.00 nC is placed on the y-axis at y = −1.00 m. A fourth charge is place on the y-axis at y = 1.00 m. What is the fourth charge if the electric field at the origin is zero?

A) 1.00 nC
B) −1.00 nC
C) 3.00 nC
D) −3.00 nC
E) 2.00 nC