Galaxy A is located 200 million light-years from Earth, while galaxy B is located 600 million light-years from Earth. According to the Hubble law, how does the motion of the two galaxies compare?
A. Galaxies A and B are moving away from Earth at the same rate.
B. Galaxy A is moving away from Earth three times as fast as galaxy B.
C. Galaxy B is moving away from Earth three times as fast as galaxy A.
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