[单选题]
A spaceship takes a nonstop journey to a planet or*82(vi(hb gz acadk4t ;nt 0and retuaj- z:o1j+i1t5 s jqkl krm75prns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 0.80c, how much time has elapsed on the:a kjmkt 11 sq5z 5+lji7opj-r Earth?
A. $3.2 \; h$
B. $7.0 \; h$
C. $15 \; h$
D. $17 \; h$
