If the concentration of a reactant 'A' is doubled and the rate of its reaction increase by a factor of 2, the order of reaction with respect to 'A' is

If the concentration of the reactants is increased, the rate of reaction for first order-

If the concentration of the reactants is increased, the rate of reaction for first order-

when the concentration of a particular reactant is tripled, the initial rate of the reaction increases by a factor of nine, what is the order of the reaction with respect to this reactant?