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One night, Lissy watched a constellation in the sky over a period of several hours. She found that the constellation seemed to move across the sky. Which of these can explain this?

A)  Some constellations are moving constellations.

B)  As the Earth rotates, constellations seem to move.

C)  The outer portions of the galaxy rotates very slowly around the Earth.

D)  All constellations move randomly through the sky.