The Figure Shows Two Unequal Point Charges, Q and Q

The figure shows two unequal point charges, q and Q, of opposite sign. Charge Q has greater magnitude than charge q. In which of the regions X, Y, Z will there be a point at which the net electric field due to these two charges is zero?

A) only regions X and Z
B) only region X
C) only region Y
D) only region Z
E) all three regions