[单选题]
A horizontal force of -j:fdxv k 4xx33)cm7g d)orsy 5.0 N acceleratesgrw p.l,gst0:q ,mk0cdtzx74s( x fg1 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. $5.0 \; N$
