The correct answer is A. 16-18.
The average rate of breathing in a minute by a man is 16-18 breaths per minute. This rate can vary depending on a number of factors, such as activity level, stress level, and health conditions.
When a person is at rest, their breathing rate is typically around 12-16 breaths per minute. However, when they are exercising, their breathing rate can increase to 20-30 breaths per minute or more. This is because the body needs more oxygen to fuel the muscles during exercise.
Stress can also cause a person’s breathing rate to increase. This is because the body releases hormones such as adrenaline and cortisol in response to stress, which can increase heart rate and breathing rate.
Certain health conditions, such as asthma and chronic obstructive pulmonary disease (COPD), can also cause a person’s breathing rate to increase. This is because these conditions make it difficult for the lungs to function properly, which can lead to shortness of breath.
If you are concerned about your breathing rate, it is important to talk to your doctor. They can help you determine if your breathing rate is normal and, if not, what may be causing it.