Step 1: Physical state of sulphur.
At ordinary temperature, sulphur exists in the solid state. Its most stable form is rhombic sulphur. Step 2: Molecular structure.
In rhombic sulphur, each molecule consists of 8 sulphur atoms forming a puckered ring (crown shape). Hence, its molecular formula is S\(_8\). Step 3: Conclusion.
Therefore, the correct molecular formula of sulphur at ordinary temperature is (D) S\(_8\).