Mercury, Unlike the Moon, Has Large Crater-Filled Plains Rather Than

Mercury, unlike the Moon, has large crater-filled plains rather than maria. The reason is thought to be that

A) Mercury had no large low-lying regions that could be filled in by lava.
B) Mercury's interior lacks the raw material for lava.
C) because of its large iron core, Mercury has a thinner mantle and therefore has fewer craters produced by volcanoes.
D) Mercury is closer to the Sun and did not receive as many crater-forming impacts as the Moon.