(c) there are dozens of galaxies in a galaxy cluster.
Galaxy clusters contain 100 to 1,000 galaxies, X-ray gas and large amounts of dark matter. The distribution of the these three components is approximately the same in the cluster. According to the research, there are about 100 billion stars in the galaxy. That's why we can say that there are dozens of galaxies in a galaxy cluster is a statement that accurately describes a relationship between two parts of the universe.
So we can conclude that option C is the right answer.
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