The reaction A + B - C + D was studied in a series of kinetics experiments. Which one of th following statements is TRUE? The rate of disappearance of B must equal the rate of appearance of C. The reaction must go through exactly one transition state. Doubling the concentration of B must double the rate of the reaction. Doubling the concentration of B must double the rate constant, k. The reaction must be second order overall. The reaction must be first order in A