The Known Mechanisms of Activation of Rubisco or of Other

The known mechanisms of activation of rubisco or of other enzymes of the Calvin cycle during illumination include all of the following except:

A) increased stromal pH.
B) light-driven entry of Mg²⁺ into the stroma.
C) phosphorylation by cAMP-dependent protein kinase.
D) phosphorylation of phosphoenolpyruvate carboxylase.
E) reduction of a disulfide bridge by thioredoxin.