[单选题]
The driver of a motorblvbqq;1 8 -5oh 4yvcwpo,p ) c4tscg,skat that can move at 10 m/s in still water wishes to travel directly across a narrow strai,cgk4cp,)t ss t in which the current flows at 5.0 m/s. At what angle upstream should the driver head the boat?
A. $27^{\circ}$
B. $30^{\circ}$
C. $60^{\circ}$
D. $63^{\circ}$
