Correct answer is (a) Greater inclination for oxidation of Sulphur
The explanation is: S-dealkylation is usually not observed due to greater inclination for oxidation of Sulphur. Sulphur has higher chances to oxidation to form sulphone or sulphoxide. These are nonspecific oxidation reactions; hence, it requires various hydrogen donors. Hence, lesser inclination for oxidation of Sulphur, lesser inclination for reduction of Sulphur, greater inclination for reduction of Sulphur is usually not the case for S-dealkylation.