The size of viruses ranges from

Options

A. 0.015 to 0.2 micron
B. 4 to 8 micron
C. 0.001 to 0.002 micron
D. 1 to 2 micron.

Explanation

### Step-by-Step Solution:

1. **Understanding Viruses**: Viruses are considered the smallest infectious agents. They are not classified as living organisms because they cannot reproduce independently and require a host cell to replicate.

2. **Size Range of Viruses**: The size of viruses is typically measured in microns (micrometers). The range of virus sizes is generally from about 0.015 microns to 0.2 microns.

3. **Microscopic Visibility**: Due to their small size, viruses cannot be seen with the naked eye. They can only be observed using high-powered microscopes.

4. **Structure of Viruses**: Viruses consist of a protein coat (capsid) that encases their genetic material (either DNA or RNA). They lack cellular structures and membranes that are found in living organisms.

5. **Conclusion**: Therefore, the correct answer to the question regarding the size of viruses is that they range from 0.015 to 0.2 microns.

### Final Answer:
The size of viruses ranges from 0.015 to 0.2 microns.

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