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A healthy 40year old woman inhales to total lung capacity and then exhales forcefully.the rate of expiratory airflow is highest at TLC and decreases linearly as exhalation continues which of the following is the most likely cause of observed decrease in expiratory airflow?

A- airway compression
B- decreased expiratory effort
C- decreased intra pleural pressure
D- doming of diaphragm
E- increased elastic recoil

also explain the reasoning for correct answer.
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