In the healthy lung, when the alveolus decreases in size dur…

In the healthy lung, when the alveolus decreases in size during a normal exhalation, the: 1. surface tension decreases 2. surfactant to alveolar surface area increases 3. surface tension increase 4. surfactant to alveolar surface tension decreases A. 1 only  B. 3 only C. 4 only D. 1 and 2 only