[单选题]
Three masses, 1.0 kg, 2.0 kg, az+d:5h he pf-zndbnmy; 6 xuu3w2uh8f p6 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location ofm yxp2uh6 wu n3u8fb;6 the center of mass of the system?
A. (1.3 m, 0.67 m)
B. (1.3 m, -0.67 m)
C. (-1.3 m, 0.67 m)
D. (-1.3 m, -0.67 m)
