Compared to impact craters on other moons, young impact craters on Europa (including the Pwyll impact crater) show a distinct absence of high crater walls, or any significant depression towards the center. What does this suggest about Europa’s icy surface?

A) It suggests that Europa’s ice crust must be extremely thick.

B) It suggests that Europa’s ice crust must consist of many small “ice plates”.

C) It suggests that these impacts were of “dirty snowball”-type comets.

D) It suggests that these impacts likely punctured Europa’s ice crust.

E) It suggests that these impacts occurred within deep “snow drifts” on Europa’s surface.