The Age of the Moon Is Determined Primarily by The

The age of the Moon is determined primarily by the:

A) measurement of radioactive elements and radioactive dating.
B) radiocarbon dating of remnants of living material such as plant life.
C) measurement of the relative concentrations of easily melted and evaporated substances, the "volatiles," and the less volatile materials, the "refractory" elements.
D) careful counting of crater over different regions of the Moon and comparison with known meteoroid densities in space.