[单选题]
A 10-kg box sitting on a horizontal surface is pulles++j-2ac z/vz0 ku ocmd by a 5.0,fp*ydxi1 zkby7 gxe)x)f-d0-N force. A 3.0-N friction force retards the motion. What is the ac)1 xd,piy-) 7bxxkedz *gf0 yfceleration of the object?
A. $0.20 \; m/s^2$
B. $0.30 \; m/s^2$
C. $0.50 \; m/s^2$
D. $5.0 \; m/s^2$