[单选题]
The length of a spaceshiz,o 9tsvdx(k ldt lttm .e xqml08(1,4p is 10 m whefjbwi2/ )u2cy n it is at rest. If the spaceship travels by you with a speed of 0.70c, what length does it appec yf/j)22 ibuwar to you?
A. $5.5 \; m$
B. $7.1 \; m$
C. $12 \; m$
D. $18 \; m$
