The Lunar Mare Are Radioactively Dated At

Multiple Choice

The lunar mare are radioactively dated at:

A) 4.6 billion years old, forming first among the lunar features.
B) 4.2-3.9 billion years old, comparable to the adjacent highlands.
C) 3.9-3.2 billion years old, forming after most of the bombardment was over.
D) 3.5-2.5 billion years old, similar to the formation of our own oceans.
E) less than a billion years old, the most recent additions to the Moon.