[单选题]
A 10-kg box sitting on a hori :xeix,6rkh x37r/lxkp*um7i6e*u ft zontal surface85y xp1t szl3s is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. s 1p slx83t5zyWhat is the acceleration of the object?
A. $0.20 \; m/s^2$
B. $0.30 \; m/s^2$
C. $0.50 \; m/s^2$
D. $5.0 \; m/s^2$