Masses Are Distributed in the Xy-Plane as Follows: 10 Kg

Masses are distributed in the xy-plane as follows: 10 kg at (2.0,6.0) m,4.0 kg at (2.0,0.0) m,and 6.0 kg at (0.0,3.0) m.Where would a 20-kg mass need to be positioned so that the center of gravity of the resulting four mass system would be at the origin?

A) (1.4,3.9) m
B) (3.9,1.4) m
C) (-1.4,-3.9) m
D) (-3.9,-1.4) m