Aluminum Meets All Criteria for Power Cables

Steps:

• Verify conductivity: Aluminum is a metal with free electrons, enabling high electrical conductivity (second to copper among common metals).
• Check density: Aluminum's density is 2.70 g/cm³, lower than copper's 8.96 g/cm³, making it relatively lightweight for cables.
• Assess oxidation resistance: Aluminum forms a thin, adherent Al₂O₃ layer that passivates the surface, preventing further aerial oxidation.
• Conclude: All three conditions are satisfied, matching option A.

Why A is correct:

• Aluminum's properties align with requirements: metallic conductivity for electricity, density <3 g/cm³ for low weight, and oxide layer per corrosion science for oxidation resistance.

Why the others are wrong:

• B: Ignores aluminum's proven oxidation resistance in power lines.
• C: Overlooks aluminum's low density advantage over alternatives like copper.
• D: Excludes aluminum's essential electrical conductivity as a metal.

Final answer: A