The Apparent Motion of Objects at Speeds Greater Than That

The apparent motion of objects at speeds greater than that of light ("superluminal motion") is caused by:

A) objects moving almost directly toward us at speeds close to (but less than) that of light.
B) gravitational lensing.
C) objects moving almost directly toward us at speeds greater than that of light.
D) the expansion of space, carrying distant galaxies away from us at apparent speeds greater than that of light.

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