This is an alloy of iron, chromium and nickel.

Options

A. stainless steel
B. steel
C. bronze
D. duralumin

Explanation

**Step-by-Step Solution:**

1. **Understanding Alloys:**
- An alloy is a mixture of two or more metals. In this case, we need to identify an alloy that consists of iron, chromium, and nickel.

2. **Identifying the Alloy:**
- The alloy that contains iron, chromium, and nickel is known as **stainless steel**. This alloy typically contains at least 10.5% chromium and some nickel.

3. **Composition of Stainless Steel:**
- Stainless steel is primarily composed of iron, with chromium added to enhance its corrosion resistance. Nickel is also included to improve its strength and ductility.

4. **Conclusion:**
- Based on the information, the alloy of iron, chromium, and nickel is **stainless steel**.

---