[单选题]
A horizontal force of 5.0 N accelk*ku,o8wye 6 jp1r2 vleratesh1uj,hxkihu5:e / ,+k zjy)yawn y2 5rty1jv3 a 4.0-kg mass, from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?
A. $2.0 \; N$
B. $3.0 \; N$
C. $4.0 \; N$
D. $5.0 \; N$