The chemical name for sand is silicon dioxide. the two elements found in a sample of this sand are (oxide, sand, silicone) and (carbon, oxygen, sand)

The first blank can be filled with silicone and the second blank can be filled with oxygen.

The silicon dioxide is a compound, which is an oxide of Silicon. The oxide are formed by the reaction of an element with the oxygen. In silicon dioxide, the silicon reacts with two oxygen molecule to form silicondioxide. So, the two elements present in the silicondioxide would be silicone and oxygen.

i believe the answer is c