Mercury Appears from Spacecraft Photographs to Resemble the Moon in Its

Mercury appears from spacecraft photographs to resemble the Moon in its surface features but with one important difference:

A) the presence of extensive plains between craters, in contrast with the surface of the Moon.
B) the presence of retrograde direction of spin compared with most other planets and moons.
C) evidence of active volcanoes on Mercury.
D) the presence of clouds and a measurable and significant atmosphere on Mercury.