[单选题]
A string of linear density 1.5xmvk7,fdosy6-mztt/c *ftn4 g* i- *i g/m is under a tension of 20 N. What shou*op; cwe be*:vld its length be ife;ob wce*:v p* its fundamental resonance frequency is 220 Hz?
A. $0.26 \; m$
B. $0.96 \; m$
C. $1.1 \; m$
D. $1.2 \; m$
