The enzyme has become saturated

The enzyme has become denatured

The concentration of enzyme is so small that the reaction has stopped occurring completely

The reaction rate has only momentarily plateaued; given enough time it will increase

None of these answers

Addition of a non-competitive inhibitor

Addition of a competitive inhibitor

Increasing substrate to supraphysiological concentrations

None of these options; cannot be changed

Catalysts increase the rate of the reaction by reducing the free energy of the transition state, which lowers the activation energy.

Catalysts increase the rate of the reaction by increasing the free energy of the transition state, which increases the activation energy.

Catalysts increase the rate of reaction by decreasing the free energy of the transition state, which increases the activation energy.

Catalysts induce a global increase of entropy to the product state of the reaction, making it more favorable and thus occurring at a faster rate.

Catalysts increase the amount of energy contributed to the reaction through heat from the reaction environment, thus increasing the rate of the reaction.