The correct choice is (a) Solvent polarity
The best explanation: Solvent polarity is the most important factor in the balance between stabilization and inactivation and is measured in terms of Log of partition co-efficient of the organic liquid between n-octanol and water. The equation is given by,
\(Log \,P=Log_{10} (\frac{[Material_{octanol}]}{[Material_{water}]})\)
The higher the Log P, the more hydrophobic is the solvent.