What does Lunar Sea refer to?

What does Lunar Sea refer to?
A: A small sea on the moon
B: A dark plain on the moon
C: A light water body illuminated by moonlight
D: None of these

Lunar Sea refers to dark plains on the moon called maria formed by ancient volcanic activity. This question tests knowledge of lunar geography in geography exams. These features are key to understanding celestial bodies. Update (as of 2025-09-05)