Final answer:
The use of anti-oxidants on the lungs is related to health and does not suggest a defect; they protect against oxidative damage and are crucial for the immune system, contributing to the longevity and durability of lung function.
Step-by-step explanation:
The use of anti-oxidants on the lungs does not necessarily imply a defect. Instead, anti-oxidants play a critical role in the respiratory system by lessening oxidative damage of cells. They help prevent lung damage from various pollutants and are vital to the immune system.
In the context of the options provided: A) Promotes safety; B) Enhances performance; C) Ensures durability; D) Implies suboptimal design, it is most accurate to say that the application of anti-oxidants ensures durability of lung function by protecting lung tissue from harmful oxidative stress and damage over time.