[单选题]
The maximum force a pilot can stand eqreh09zx sv 0)(6bhlis about seven times his weight. What ioaz ik :u2;5jds the minimum ra 5djz:u; oai2kdius of curvature that a jet plane's pilot, pulling out of a vertical dive, can tolerate at a speed of 250 m/s?
A. $4.25 \; m$
B. $3.64 \; m$
C. $1060 \; m$
D. $911 \; m$
