Match List-I (Naturally occurring substances) with List-II (Elements) and select the correct answer using the codes given the lists:

Correct Option (d):

• Diamond is an allotrope of carbon, composed entirely of carbon atoms.
• Marble is primarily composed of calcium carbonate (CaCO₃), making calcium its key elemental constituent.
• Sand predominantly consists of silicon dioxide (SiO₂), with silicon as the main element.
• Ruby is a variety of corundum, which is aluminium oxide (Al₂O₃), thus containing aluminium as its principal metallic element.

Incorrect Options:

Options (a), (b), and (c) are incorrect as they contain one or more mismatches between the naturally occurring substance and its primary elemental composition, contrary to the established chemical facts.