Introduction:
In the field of metallurgy, ferritic stabilizers are elements that are added to steel or other alloys to prevent the formation of austenite and promote the formation of ferrite. Ferrite is a type of iron crystal structure that is characterized by a body-centered cubic (BCC) arrangement of atoms. It has a lower carbon solubility compared to austenite, which has a face-centered cubic (FCC) arrangement. Ferritic stabilizers help to improve the strength and corrosion resistance of the material.

Explanation:
Among the options provided, the correct answer is option 'D' - Chromium. Chromium is a ferritic stabilizer that is commonly used in stainless steel alloys. It has a strong affinity for carbon and forms a stable carbide, chromium carbide (Cr23C6), which precipitates out during cooling. This prevents the formation of austenite and promotes the formation of ferrite.

Advantages of Chromium as a Ferritic Stabilizer:
- Improved Corrosion Resistance: Chromium enhances the corrosion resistance of steel by forming a passive oxide layer on the surface, which protects it from environmental factors.
- Increased Strength and Hardness: The presence of chromium in the ferrite structure increases the strength and hardness of the material, making it suitable for various applications.
- Heat Resistance: Chromium improves the heat resistance of steel, allowing it to retain its mechanical properties at high temperatures.
- Weldability: Chromium-containing steels have good weldability, making them easier to join and fabricate.

Other Ferritic Stabilizers:
While chromium is a commonly used ferritic stabilizer, there are other elements that can also serve this purpose. Some examples include:
- Aluminum: Aluminum is used as a ferritic stabilizer in some stainless steel alloys. It forms aluminum nitride (AlN) precipitates, which prevent the formation of austenite.
- Titanium: Titanium is another ferritic stabilizer that forms titanium carbide (TiC) precipitates. It is often used in conjunction with niobium to control the grain size and improve the mechanical properties of the material.
- Niobium: Niobium is a ferritic stabilizer that forms niobium carbide (NbC) precipitates. It is commonly used in high-strength low-alloy (HSLA) steels.

Conclusion:
In summary, among the elements listed, chromium is the ferritic stabilizer. It promotes the formation of ferrite, improves the corrosion resistance, strength, and heat resistance of steel. Other ferritic stabilizers include aluminum, titanium, and niobium, each with their own specific benefits and applications.