[单选题]
Relative to a statio oh 0sp3jjoymz3 7x.nlfnj-:9 nary observ+3dw*lng 5m9t bfs2 qt l: yabuu0;ll(er, a moving clock
A. always runs slower than normal.
B. always runs faster than normal.
C. keeps its normal time.
D. can do any of the above. It depends on the relative velocity between the observer and the clock.
