Europa,one of the Galilean Satellites of Jupiter,has a Surface Consisting

Europa,one of the Galilean satellites of Jupiter,has a surface consisting of

A) rock,heavily cratered like the highlands of our Moon.
B) an ancient,icy crust covered with numerous craters;no surface cracks or groove belts that would indicate internal activity.
C) a relatively young,icy crust covered with a network of streaks and cracks,and only a few impact craters.
D) an icy crust showing two interlocking types of terrain,one ancient and heavily cratered,the other younger with systems of parallel grooves.