# Rate of a chemical reaction can be kept constant by

$(A)\;\text{Stirring the compounds } \\ (B)\;\text{Keeping the temperature constant} \\(C)\;\text{both (a) and (b)} \\(D)\;\text{none of these}$

The rate of a reaction depends upon constant of reactant , surface area of reactant , pressure , temperature presence of light and catalyst.
Hence B is the correct answer.