Why is the South Pole-Aitken Basin thought to be exceptionally old？A．The walls of the Basi

Why is the South Pole-Aitken Basin thought to be exceptionally old？

A．The walls of the Basin are more reflective than those of most other craters.

B．Testing of rocks from the Basin"s floor proved them to be as old as the Moon itself.

C．Many small craters have been detected at the bottom of the Basin.

D．A large amount of dust has been detected in and around the Basin.

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