One Consequence of Einstein's Ideas About the Speed of Light

Multiple Choice

One consequence of Einstein's ideas about the speed of light is that

A) if two events take place at the same time for one observer, they will occur simultaneously for all observers.
B) whether events are seen as simultaneous or not depends on the motions of observers.
C) two events cannot happen at the same time for two different observers.
D) it is not possible to know when an event happens.
E) people could design and fly interstellar spaceships moving as fast as light itself.