[单选题]
One of Einstein's postulates in formulating the special theory o ch1d+lu5fpi 9f relatii .vzu07lr** bbiljk ,vity was thatik0,l 7j bl *r.zi*bvu the laws of physics are the same in reference frames that
A. accelerate.
B. move at constant velocity with respect to an inertial frame.
C. oscillate.
D. are stationary, but not in moving frames.