Normal range of breathing rate per minute in an average adult person at rest is

Options

A. `9-12`
B. `15-18`
C. `21-24`
D. `30-33`

Explanation

### Step-by-Step Solution:

1. **Understanding Breathing Rate**: Breathing rate refers to the number of breaths a person takes in one minute. It is an important physiological measurement that indicates how well a person is breathing.

2. **Normal Breathing Rate**: The normal breathing rate for an average adult person at rest is typically measured in breaths per minute.

3. **Identifying the Correct Range**:
- The question provides several options for the normal range of breathing rates:
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