Exercise-induced asthma would reduce airflow by  increasing airway resistance. lowering the intrapulmonary pressure. decreasing the effectiveness of respiratory muscles. increasing the atmospheric pressure..

Exercise-induced asthma would reduce airflow by increasing airway resistance.

Here's a step-by-step explanation:

1. Exercise-induced asthma is a condition where vigorous physical activity triggers an asthma attack. This happens due to the changes in temperature and humidity in the airways caused by heavy breathing during exercise.

2. When an asthma attack occurs, the muscles around the airways tighten up and the lining of the airways becomes swollen or inflamed. This leads to a reduction in the size of the airways.

3. The reduction in the size of the airways increases the resistance to airflow. This is because the same amount of air now has to pass through a smaller space, which requires more force.

4. This increased resistance to airflow makes it harder to breathe, especially to exhale, which is a common symptom of asthma.

5. The other options (lowering the intrapulmonary pressure, decreasing the effectiveness of respiratory muscles, increasing the atmospheric pressure) are not directly related to the mechanism of exercise-induced asthma.

So, the correct answer is that exercise-induced asthma would reduce airflow by increasing airway resistance.