[单选题]
A spaceship takes a nonstop journey to a planet and:4k ozz 9)qxem ret3h br l4a4(e6n:5 cqxypj-rlb urns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 4 rle5ql4jb3x6chy- par:(nb 0.80c, how much time has elapsed on the Earth?
A. $3.2 \; h$
B. $7.0 \; h$
C. $15 \; h$
D. $17 \; h$
