Three Charges, Each of Q = 3

Three charges, each of Q = 3.2 × 10^-19 C, are arranged at three of the corners of a 20-nm square as shown. The magnitude of the electric field at D, the fourth corner of the square, is approximately

A) 1.4 × 10⁷ N/C.
B) 1.0 × 10¹¹ N/C.
C) 3.6 × 10¹⁰ N/C.
D) 30 N/C.
E) 1.8 × 10⁷ N/C.