Answer is 4.
The graph shows the competitive inhibition of an inhibitor to an enzyme. It is given that when the substrate concentration is increased, then there will be found increase in activity of enzyme. This will leads to enhance the rate of the reaction. Because the inhibitor binds to the active site of an enzyme. When the substrate concentration is increased, then it will replace the inhibitor which is attached at the active site. That's why there will be found increase in the rate of the reaction.
Part A Insert non-labeled graph from page 150 replica created and inserted below Rate ofrece with...