[单选题]
A horizontal force of 5.0 N accelerates a 4.0-kg mass, from r:;tamdnl0 n 8ixitv b0q 2sm9+x5 p(3 nv7huo68hni tnest, 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. $5.0 \; N$