[单选题]
A spaceship takes a nonstop journey to a planet and returns le1h4 a wsr,*re tyjzy/. e)ejt;38wjiq(ofwp5ua3s o0.k7 j ln 10 hours according to a clock on the spaceship. If the speed of the spqoo s(lfwjp. 3a57k0uaceship is 0.80c, how much time has elapsed on the Earth?
A. $3.2 \; h$
B. $7.0 \; h$
C. $15 \; h$
D. $17 \; h$
Post time 2024-1-14 16:03:04