[单选题]
The length of a spaceship is 10 hh 2a2q7v5vz t ji*t+fm when mo(jen,b mlz )zu1*bxa 9z3 a6it is at rest. If the spaceship travels by you with a speed of 0.70c, what length doeslznem,b1 ma3zb9z6 j)ao xu (* it appear to you?
A. $5.5 \; m$
B. $7.1 \; m$
C. $12 \; m$
D. $18 \; m$
