Four Point Charges $Q$ Of Equal Magnitude and Sign Are Arranged on Three of Arranged

Four point charges $Q$ of equal magnitude and sign are arranged on three of the corners of the square of side $d$ as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square?

A) $\mathrm { A }$
B) $B$
C) $\mathrm { C }$
D) $D$