What Is the Most Likely Cause of the Smooth and Relatively

Multiple Choice

What is the most likely cause of the smooth and relatively crater-free surfaces of lunar maria?

A) Volcanic ash that rained on the surfaces of the basins in recent geological times
B) Dust storms that eroded and smoothed the surface
C) Sediments left behind after water flowed into the basins and evaporated
D) Lava flows relatively late in the geological history of the Moon