[单选题]
How fast should a movini mw 6c gy3w45x66)hxlk(nheoc 8w7vn g clo8vrrg2l57 z pr k5ybtj85jh-hck travel if it is to be observed by a stationary observer as running at o7-l 5rrkp rj85jvyt5h zhb2 8gne-half its normal rate?
A. $0.50 \; c$
B. $0.65 \; c$
C. $0.78 \; c$
D. $0.87 \; c$
