The correct answer is Option A: Ag, Cu and Pb. Here's why :

Sulphide ores are minerals where the metal is combined with sulfur. Many metals are found in this form due to the chemical reactivity of sulfur.

• Ag (Silver): Silver is often found as the sulfide mineral argentite (Ag₂S).
• Cu (Copper): Copper is commonly found as chalcopyrite (CuFeS₂) and chalcocite (Cu₂S).
• Pb (Lead): Lead is extracted from the sulfide mineral galena (PbS).

Let's look at why the other options are incorrect :

• Option B: Ag, Mg and Pb - Magnesium (Mg) is typically found in oxide ores, not sulfide ores.
• Option C: Ag, Cu and Sn - Tin (Sn) is primarily found in oxide ores, not sulfide ores.
• Option D: Al, Cu and Pb - Aluminum (Al) is mainly extracted from bauxite ore, an oxide mineral.