The correct option is (c) Acid base catalysis
The best explanation: The reaction represents the case of hydrolysis of acetyl imidazole which explains the acid base catalysis. The imidazole functions as a base catalyst in addition to OH. Catalysis by imidazole implies that the energy barrier for hydrolysis is lowered by proton itself. Therefore, the nuclepohilicity of the water molecule is enhanced without the generation of a high concentration of OH. The catalytic transition state is stabilized by avoiding the formation of unstable high energy species due to the hydrogen bond in the transition state.