What Is the Latest Hypothesis for the Creation of the Ovoids

Multiple Choice

What is the latest hypothesis for the creation of the ovoids on the surface of Miranda?

A) A secondary bombardment episode occurred near the Kuiper belt
B) Nitrogen ices warmed by the Sun melt and refreeze
C) Gravitation pulled together fragments of an earlier shattered moon
D) Tectonic plate movement at various subduction zones in its oceans
E) internal heat driving large and slow convection currents in the icy mantle