What material is typically used for the construction of above ground fuel tanks?

Above ground fuel tanks are commonly made from steel due to its strength, durability, and resistance to impact and environmental factors. Steel is capable of withstanding the physical stress of holding large volumes of fuel and can be treated to resist corrosion, which is essential since fuel tanks are often exposed to outdoor elements. Additionally, steel construction allows for safe containment of fuel, reducing the risk of leaks and ensuring compliance with safety regulations.

While fiberglass and plastic are also materials used in the construction of some fuel storage tanks, they do not provide the same level of structural integrity and durability as steel, especially for larger tanks that must adhere to stricter safety standards. Copper is not typically used for fuel tanks due to its cost and the fact that it can react with certain fuels. Thus, steel remains the preferred choice for above ground fuel tanks, making it the correct answer.