Metalloid among the following is

Options

A. Carbon.
B. Germanium
C. Lead
D. All of these

Answer

To determine which of the given options is a metalloid, we need to first understand what metalloids are and then analyze each option provided.

### Step-by-Step Solution:

1. **Define Metalloids**:
Metalloids are elements that exhibit properties of both metals and non-metals. They typically have a metallic luster, are semi-conductors, and can be brittle.

2. **List the Given Options**:
- Option A: Carbon (C)
- Option B: Germanium (Ge)
- Option C: Lead (Pb)
- Option D: All of these

3. **Analyze Each Option**:
- **Option A: Carbon**: Carbon is classified as a non-metal. It does not exhibit the properties of a metalloid.
- **Option B: Germanium**: Germanium is classified as a metalloid. It has properties of both metals and non-metals, making it a semiconductor.
- **Option C: Lead**: Lead is classified as a metal. It does not exhibit the properties of a metalloid.
- **Option D: All of these**: Since only Germanium is a metalloid, this option is incorrect.

4. **Conclusion**:
The only metalloid among the given options is Germanium (Ge).

### Final Answer:
**The metalloid among the following is Germanium (Option B).**

---