A Striking Characteristic on Triton,the Largest Satellite of Neptune,is

A striking characteristic on Triton,the largest satellite of Neptune,is:

A) a brightness variation: One hemisphere is as bright as ice and the other hemisphere is as dark as asphalt.
B) plumes of nitrogen gas rising from the icy surface, possibly as a result of radioactive heating.
C) an interconnecting network of parallel grooves, indicating tectonic activity in geologically recent times.
D) a crater so large that the impact that created it must have come close to shattering the satellite.