What is the desired outcome of the anodising process?

The anodising process is primarily intended to create a protective oxide layer on the surface of metals, especially aluminium, thereby enhancing their resistance to corrosion and wear. This oxide layer forms naturally upon exposure to oxygen, but anodising accelerates and thickens this layer, significantly improving the metal's resilience.

By electing option A, the focus is placed on the prevention of oxidation through the anodising process. This is a key aspect, as the thicker and more stable oxide layer formed during anodising not only prevents further oxidation but also serves to protect the underlying metal from environmental factors that can lead to degradation.

While other aspects, such as improving aesthetics and enhancing durability, are indeed benefits of anodising, the fundamental goal is to inhibit oxidation, thus preserving the integrity of the metal over time. Therefore, the primary motivation of anodising is to create that protective barrier against oxidation which promotes long-term longevity and functionality of the material.