Magnetism in materials is due to

Options

A. electrons at rest
B. motion of electrons
C. protons at rest
D. all neutrons at rest

Explanation

### Step-by-Step Solution

1. **Understanding Magnetism**: Magnetism in materials is a phenomenon that can be observed when certain materials exhibit attractive or repulsive forces in the presence of a magnetic field.

2. **Identifying the Cause**: The question asks what causes magnetism in materials. We have four options to consider:
- Option 1: Electrons at rest
- Option 2: Motion of electrons
- Option 3: Protons at rest
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