[单选题]
A 10-kg box sitting a 7ynx r6-mlgsw4 oo+9on a horiz:- +3mfcu3uy.phiy mt em3n/qontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What m-ch+fyp:tu .u 3m/i3q ynem3is the acceleration of the object?
A. $0.20 \; m/s^2$
B. $0.30 \; m/s^2$
C. $0.50 \; m/s^2$
D. $5.0 \; m/s^2$