Discussion
The surface samples of moon are remarkably depleted in :
Answer: B
Lunar surface samples are remarkably depleted in volatile elements.
Apollo samples contain much less of volatile elements such as sodium, potassium, lead, zinc and water than terrestrial rocks, and are relatively enriched in refractory elements such as calcium, aluminium, titanium and uranium. This pattern is explained by the high temperatures of the giant impact and the lunar magma ocean, which drove off the volatiles.
So non-volatile and refractory elements, including refractory trace metals, are the ones that are relatively enriched, not depleted.
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