by adding WATER in `H_(2)SO_(4)` by adding `H_(2)SO_(4)` in water by adding GLACIAL acetic acid in `H_(2)SO_(4)` NONE of these
Solution :Concentrated `H_2SO_4`, is diluted by adding the conc. `H_2SO_4` in the water drop by drop with constant stirring because it is an exofhermic REACTION and by doing so heat is generated slowly and dissipiated in the atmosphere.