[单选题]
How fast would a rocket shi c4z2dh(q xh82ms 3e- gg1rjxip have to move top7 ,c )o:u;x; lt w*lp(e8 obix1eefed contract to half of its proper length (as observed by a stationwxdf;; (e:o*xo8lp bit eu7),eepl1c ary object)?
A. $0.50 \; c$
B. $0.65 \; c$
C. $0.78 \; c$
D. $0.87 \; c$
