[单选题]
A string of linear d 6 sw9ogp*xnh(*p1jvp4ba/ha sj k qluv) o09,ow/c5hensity 1.5 g/m is under a tension of 20 N. What should its length be if its fundamental resonance frequencp5vs)kq ju0vahh *pl9oa /c4/,bw 1ojy is 220 Hz?
A. $0.26 \; m$
B. $0.96 \; m$
C. $1.1 \; m$
D. $1.2 \; m$