In the galaxy cluster 1E0657-56, the dark matter seems to have been displaced from the luminous matter during a collision with another cluster. Our understanding of how this might have occurred depends on the premise that:

Question

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Our current understanding of dark matter is that it interacts only through gravitational force, so the displacement of dark matter from luminous matter during a collision can be explained by the differing interactions of the two types of matter with each other and with the cluster's gravitational field. Choices A, B, and D are not relevant to the explanation.

In the Galaxy Cluster 1E0657-56, the Dark Matter Seems to Have