Which part of the Moon is the oldest and why?
A. The dark circular maria because they have had more time to darken.
B. The light-colored lunar highlands because they contain a higher density of craters per area.
C. The light-colored lunar highlands because they are lighter in color from longer weathering.
D. The dark circular maria because they have had more time to be eroded and smoothed off.
E. None of these choices are correct.
Answer: B
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