[单选题]
The length of a spacc(vmb8a0:xtk dax.b5 j n*uz 4eship is 10 m when it is at rest. If t a-0l shwu/(yfhe spaceship travels by you with a speed of 0.70c, what length does it appeaa (ufw-hsl/0y r to you?
A. $5.5 \; m$
B. $7.1 \; m$
C. $12 \; m$
D. $18 \; m$
