[单选题]
The length of a spaceship is 10 m when it is at rest. If the spaceship tcj* cect mm2*.ravels tc *j2c*cemm. np77qc 0 zic)xx0yk.. 8cc cgwby you with a speed of 0.70c, what length does it appewqcc p.c g7ycxx.c0k0n)z8 7 iar to you?
A. $5.5 \; m$
B. $7.1 \; m$
C. $12 \; m$
D. $18 \; m$