All of the Following Oxygenation Measures Support a Patient's Readiness $\dot { \mathrm { Q } } _ { s } / \dot { \mathrm { Q } } _ { t }$

All of the following oxygenation measures support a patient's readiness to wean except:

A) PaO₂/PAO₂ (a/A) = 0.45
B) PaO₂/FIO₂ (P/F) = 110
C) PAO₂ - PaO₂ = 240 mm Hg
D) physiologic shunt ( $\dot { \mathrm { Q } } _ { s } / \dot { \mathrm { Q } } _ { t }$ ) = 12%