Rutherford's theory assumed which of the following paths for the electron ?

Options

A. Spherical
B. Circular
C. Spiral
D. Not defined

Explanation

### Step-by-Step Solution:

1. **Understanding Rutherford's Theory**:
- Rutherford's atomic model was proposed in 1911 after his famous gold foil experiment. He suggested that an atom consists of a small, dense nucleus surrounded by electrons.

2. **Electron Movement**:
- According to Rutherford, the electrons are not randomly placed around the nucleus but rather move in specific paths.

3. **Path of Electrons**:
- The specific path that Rutherford proposed for the electrons is circular. This means that the electrons revolve around the nucleus in a circular orbit.

4. **Elimination of Other Options**:
- The question provides multiple-choice options. We can eliminate the incorrect options:
- **Spherical**: This is incorrect because it suggests a three-dimensional shape rather than a path.
- **Spiral**: This is also incorrect as it implies a different type of movement.
- **Not Defined**: This option is incorrect as Rutherford did define the path of the electrons.

5. **Conclusion**:
- The correct answer is that Rutherford's theory assumed that electrons move in a **circular path** around the nucleus.

### Final Answer:
- The correct option is **circular**.