What Observational Evidence Suggests That Uranus Was Struck by a Large

Multiple Choice

What observational evidence suggests that Uranus was struck by a large planetesimal early in its formation?

A) Astronomers have identified a large impact crater on the surface of Uranus.
B) Uranus orbits the Sun in the opposite direction as the other planets.
C) Uranus' rotational axis is tipped over.
D) Uranus' moon Miranda shows a patchwork surface, suggesting a collision in its past.