Why Are the Lunar Maria Concentrated Almost Entirely on the near Side

Why are the lunar maria concentrated almost entirely on the near side of the Moon?

A) The apparent concentration of maria on the near side is merely an illusion caused by the fact that the near side is the only side that we can see.
B) The crust is thicker on the far side of the Moon, restricting massive lava flows after asteroid impact.
C) Earth's gravity has concentrated asteroid impacts on the near side of the Moon.
D) Earth's gravity has concentrated meteoroid impacts on the far side of the Moon, erasing the ancient, smooth lava plains.