Which metal resists rust best for screws?

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Multiple Choice

Which metal resists rust best for screws?

Explanation:
Brass resists rust best because it’s a copper-zinc alloy, not an iron-based metal. Iron and steel readily form rust when exposed to moisture and oxygen, so plain steel screws will corrode over time in outdoor or wet conditions. Brass avoids that problem: it doesn’t contain iron, and while it can develop a patina, it forms a protective surface that slows further corrosion. The other options describe the screw’s geometry or drive style, not the metal and its resistance to rust, so they don’t address rust performance.

Brass resists rust best because it’s a copper-zinc alloy, not an iron-based metal. Iron and steel readily form rust when exposed to moisture and oxygen, so plain steel screws will corrode over time in outdoor or wet conditions. Brass avoids that problem: it doesn’t contain iron, and while it can develop a patina, it forms a protective surface that slows further corrosion. The other options describe the screw’s geometry or drive style, not the metal and its resistance to rust, so they don’t address rust performance.

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