12. For the reaction: H2(g) +12(g) 2 HI(g), the rate law is: reaction rate = k[H2][12]. Which statement is true? (A) If the volume of the container is halved at constant temperature, the reaction rate doubles. (B) If the concentration of both reactants is doubled at constant temperature, the reaction rate doubles. (C) If the concentration of just the H is doubled at constant temperature, and the concentration of the l, remains the same, the reaction rate will double. (D) If the concentration of both reactants is cut in half, at constant temperature, the reaction rate will be cut in half