What Are the Most Common Shapes of Lunar Craters and Why

What are the most common shapes of lunar craters and why?

A) round, because the shock wave from the impact that produced them spread out uniformly in all directions
B) random shapes, because mantle convection has deformed the surface and distorted the craters since their production by impacts of meteoroids
C) all shapes from round to long and thin, depending on the angle at which the projectile hit the surface
D) round, because most of the craters were produced by volcanic explosions that formed calderas, not by meteoroid impacts