[单选题]
A string of linear density 1.5 g/m is under a tensjw o xa7qk27w,,fplw;ion of 20 N. Whatf607 t0sk vbxx should its length be if its fundamental res xbt6f70vk0s xonance frequency is 220 Hz?
A. $0.26 \; m$
B. $0.96 \; m$
C. $1.1 \; m$
D. $1.2 \; m$