Three Particles Are Placed in the Xy Plane

Multiple Choice

Three particles are placed in the xy plane.A 30-g particle is located at (3,4) m,and a 40-g particle is located at (-2,-2) m.Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?

A) (-3,-1) m
B) (+1,+3) m
C) (+3,-1) m
D) (-1,-3) m
E) (-0.5,-2) m