[单选题]
A string of linear density 1.5 g/m is ui4lbc :0+i luo3 qfw*bnder a tension of 20 N. +g0) slpdlp9sn7; dod )t)zem What should its length be if its fundamental )nzm sg eo)pl d+;0)dpt79d slresonance frequency is 220 Hz?
A. $0.26 \; m$
B. $0.96 \; m$
C. $1.1 \; m$
D. $1.2 \; m$
