[单选题]
A 10-kg box sitting on a horizontal surface is pyy*weg(l hgl .a/4 o:aulled by a 5 6bczlfpcx rq gxep((5i8k36, .0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the object?b i8pre6l x3fc(,6 zpcg5( qxk
A. $0.20 \; m/s^2$
B. $0.30 \; m/s^2$
C. $0.50 \; m/s^2$
D. $5.0 \; m/s^2$