Which among the following will show anisotropy ?

Options

A. Glass
B. NaBr
C. Plastic
D. Rubber

Explanation

To determine which among the given options will show anisotropy, we need to understand the concept of anisotropy and the nature of the materials listed.

### Step-by-Step Solution:

1. **Understand Anisotropy**:
- Anisotropy refers to the directional dependence of a property. In materials, this means that the physical properties (like electrical resistance, thermal conductivity, refractive index, etc.) vary when measured along different directions.

2. **Identify the Nature of Each Material**:
- **Glass**: Typically an amorphous solid, which means it does not have a long-range order in its structure. Amorphous solids are generally isotropic.
- **Anabia (NaBr)**: Sodium bromide (NaBr) is a crystalline solid. Crystalline solids have a well-defined structure and can exhibit anisotropic properties due to their ordered arrangement of particles.
- **Plastic**: Most plastics are also amorphous or semi-crystalline. They tend to be isotropic in nature.
- **Rubber**: Rubber is an elastomer and is generally considered to be isotropic, although it can show some anisotropic behavior under certain conditions (like stretching).

3. **Determine Which Material is Crystalline**:
- Among the options, NaBr is the only crystalline substance. Crystalline solids, due to their ordered arrangement of atoms or molecules, typically show anisotropic properties.

4. **Conclusion**:
- Since NaBr is the only crystalline material listed, it will show anisotropy. Therefore, the answer to the question is NaBr.

### Final Answer:
**NaBr (Anabia) will show anisotropy.**