Spirometry results reveal a vital capacity of two liters which is well below the predicted value of five liters. this suggests which disorder? a. obstructive pulmonary disease b. asthma c. restrictive disease d. emphysema

The answer is restrictive disease.

Restrictive disease it's when the total lung volume is too low. The normal value is 5 liters and 2 liters would be classified as restrictive disease.
It increased work of breathing and causes inadequate oxygenation.
 
Spirometry is not 100% accurate diagnosis because there is always residual lung volume that can't be measured but it's still very good to diagnose.

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