Non-magnetic materials are

Options

A. Plastic, wood, iron and paper
B. Iron, nickle and cobalt
C. Leather, iron, nickle and clothes
D. Plastic, leather, clothes and paper

Answer

### Step-by-Step Solution:

1. **Understanding Non-Magnetic Materials**:
- Non-magnetic materials are defined as substances that are not attracted to magnets and cannot be magnetized themselves.

2. **Identifying Examples of Non-Magnetic Materials**:
- Common examples include paper, plastic, wood, and cloth. These materials do not exhibit magnetic properties.

3. **Differentiating Between Magnetic and Non-Magnetic Materials**:
- Magnetic materials, such as iron, nickel, and cobalt, are attracted to magnets and can be magnetized. In contrast, non-magnetic materials do not have these properties.

4. **Analyzing the Options**:
- Given a list of materials, we need to identify which ones are non-magnetic.
- For example, if the options include plastic, wood, iron, paper, leather, and cloth, we can categorize them based on their magnetic properties.

5. **Selecting the Correct Option**:
- From the analysis, we find that plastic, wood, paper, leather, and cloth are non-magnetic materials, while iron is magnetic.
- Therefore, the correct option that lists only non-magnetic materials is option 4.

### Final Answer:
- The non-magnetic materials are plastic, leather, cloth, and paper. The correct option is option 4.