The $100$kip lateral force is centered in the building floor plan, which is $40ft$ long and $20ft$ wide. If the diaphragm shear capacity is $3200l\frac{b}{f}t$ and Wall C is $12ft$ long, what is the minimum length of drag strut required to transfer the full lateral force to Wall C$?(2\mathrm{.}5$ Points$)$

$19\mathrm{.}25ft$

$0ft$

$8\mathrm{.}33ft$

$31\mathrm{.}25ft$