[单选题]
Relative to a statio-u4fza- v bpba8;rfs*k.ww u3nary observer, a mo )luwshamyfb;5/ws). ving 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.
