In a chemical reaction A is converted into B. The rates of reaction, starting with initial concentrations of A as \[2\times {{10}^{-3}}M\] and \[1\times {{10}^{-3}}M,\] are equal to \[2.40\times {{10}^{-4}}M{{s}^{-1}}\] and \[0.60\times {{10}^{-4}}M{{s}^{-1}}\] respectively. The order of reaction with respect to reactant A will be

• A. 0                                 
• B. 1.5   
• C. 1                                 
• D. 2