One of the Striking Features of the Overall Surface of Mars

Multiple Choice

One of the striking features of the overall surface of Mars is the:

A) two very distinct hemispheres, one of them lower and smoother than its counterpart and almost free of craters.
B) presence of active volcanoes and lava flows over the whole surface, including near to the poles, where these flows melt the icecaps regularly.
C) remarkable similarity of surface features across the whole of the planet, including uniform distribution of craters and ancient river valleys.
D) uniform distribution of water-ice frost over the whole surface, hidden in the shade of rocks, both winter and summer.