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The choice of QT Steel as the correct answer for being lighter in weight when constructing cargo tanks is based on its specific properties. QT Steel, which stands for Quenched and Tempered Steel, undergoes a heat treatment process that enhances its strength and durability while allowing for a thinner material to achieve the same strength as thicker alternative steels.

This results in QT Steel having a higher strength-to-weight ratio compared to standard grades of steel. It is designed for applications that require lightweight structures, such as cargo tanks, where reducing the overall weight can improve fuel efficiency and cargo capacity. Additionally, the treated properties of QT Steel make it suitable for resisting the stresses and strains typical in cargo transport scenarios.

In contrast, other grades like NQT Steel (Non-Quenched and Tempered) or Heavy-Duty Steel are generally heavier and might be designed for different applications where extreme durability and resistance to heavy loads are prioritized over weight. Standard Steel represents a more conventional approach without the specialized treatment that enhances strength while reducing weight. Thus, QT Steel's combination of lightweight characteristics and robustness makes it the preferred choice.