This figure is a graph. The y-axis is labeled"energy consumed during reaction." The y-axis is labeled"reaction progress." The left end of the x-axis is labeled"start," while the right end is labeled"end." There are two plot lines on the graph. The blue plot line is labeled reaction A. The red plot line is labeled reaction B. Both reaction A and reaction B reaction start about three quarters of the way up the y-axis. The blue plot line increases sharply at the start of the reaction, peaking at the top of the y-axis. Reaction A then quickly dives down toward the x-axis about halfway through the reaction, after which it levels out until the end of the reaction. Reaction B has the same shape plot line as reaction A. The main difference is that reaction B Image Courtesy of 3DScience.com The graph above shows the progress of a chemical reaction. Based on the graph, which of the following is true? Reaction A is enzyme-catalyzed, while reaction B is not enzyme-catalyzed. Reaction A is not enzyme-catalyzed, while reaction B is enzyme-catalyzed. Reaction A uses cofactors, while reaction B does not use cofactors. Reaction A and reaction B use cofactors.