If an Area of the Lung Is Not Ventilated Because $\mathrm{PO}_{2}$

If an area of the lung is not ventilated because of bronchial obstruction, the pulmonary capillary blood serving that area will have a $\mathrm{PO}_{2}$ that is

A) equal to atmospheric $\mathrm{PO}_{2}$
B) equal to mixed venous $\mathrm{PO}_{2}$
C) equal to normal systemic arterial $\mathrm{Po}_{2}$
D) higher than inspired $\mathrm{PO}_{2}$
E) lower than mixed venous $\mathrm{Po}_{2}$