The noise produced in office is normally at the level of

Options

A. 20 db.
B. 30 db.
C. 40 db.
D. 60 db.

Explanation

To answer the question regarding the noise level produced in an office, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Noise Levels**: Noise is measured in decibels (dB), which is a logarithmic unit used to express the intensity of sound.

2. **Identifying Normal Office Noise Levels**: The permissible ambient noise level for an office environment typically ranges from 30 decibels to 40 decibels.

3. **Comparing with Other Noise Levels**:
- A noise level of 80 decibels is considered to indicate noise pollution.
- A noise level of 140 decibels is deemed unbearable.

4. **Conclusion**: Based on the information, the noise produced in an office is normally at the level of **30 to 40 decibels**.