[单选题]
How fast would a rocken3eh+7r.n 1m 7qtp g*wa6u bbkt ship have to move to contract to half+i ldyw0bp mc +y)8;jc of its proper length p+)wy;ycm8+il 0 dj bc(as observed by a stationary object)?
A. $0.50 \; c$
B. $0.65 \; c$
C. $0.78 \; c$
D. $0.87 \; c$
