[单选题]
If you walk 6.0 km in a straight l1s p)6l ahxj6;ydm5erine in a direm 4)ixr);xukrc,t jxl; rb,4kq 8owv /ction north of east and you end up 2.0 km north and several kilometers east. How manw, xcrm) /li ;8,jkk)xr4vt4rq oxb; uy degrees north of east have you walked?
A. $19^{\circ}$
B. $45^{\circ}$
C. $60^{\circ}$
D. $71^{\circ}$
