Spectral Lines from Galaxy B Are Redshifted from Their Rest

Multiple Choice

Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A.According to Hubble's law,what can you say about their approximate relative distances?

A) Galaxy A is twice as far as Galaxy B.
B) Galaxy B is four times as far as Galaxy A.
C) Galaxy A is four times as far as Galaxy B.
D) Galaxy B is twice as far as Galaxy A.
E) Not enough information to say-you need to know Hubble's constant to answer this question.