**Core Concept**
Passivating alloys are a type of corrosion-resistant material that undergoes a chemical reaction to form a protective oxide layer on its surface. This process, known as passivation, involves the formation of a thin, adherent layer that prevents further corrosion.

**Why the Correct Answer is Right**
Passivating alloys, such as stainless steel, contain a high percentage of chromium (usually above 12%). The chromium reacts with oxygen to form a thin layer of chromium oxide, which provides a barrier against corrosion. This process is facilitated by the presence of iron and other metals in the alloy. The chromium oxide layer is self-healing and can repair minor scratches or damage, making passivating alloys highly resistant to corrosion.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the type of alloy that undergoes passivation. While some alloys may exhibit corrosion resistance, they may not undergo the same passivation process as stainless steel.
**Option B:** This option is incorrect because it does not mention the role of chromium in the passivation process. Chromium is the key element responsible for the formation of the protective oxide layer.
**Option C:** This option is incorrect because it does not accurately describe the process of passivation. While some alloys may undergo a similar process, the specific mechanism and outcome are not the same as those described for passivating alloys.

**Clinical Pearl / High-Yield Fact**
Passivating alloys are commonly used in medical devices, such as surgical instruments and implants, due to their high corrosion resistance and biocompatibility. The formation of a protective oxide layer on the surface of these alloys helps to prevent corrosion and ensures the longevity of the device.

**Correct Answer: C. Stainless steel and other alloys that contain a high percentage of chromium undergo passivation to form a protective oxide layer on their surface.**