[单选题]
A string of linear density 1.5 g/m is8xr+f nie//gx under a tension of 20 N. W7r rhu)ft8csz2v+h2*sow +ut hat should its length be if its fundamental resonance 2 t2 7w+usv )rtr8c h+f*ozushfrequency is 220 Hz?
A. $0.26 \; m$
B. $0.96 \; m$
C. $1.1 \; m$
D. $1.2 \; m$
