What factor may influence enzyme activity?

There are many factors that may influence enzyme activity, such as: temperature, pH, enzyme concentration, substrate concentration, and the presence of inhibitors or activators. It can be temperature because it can be too high above optimal temperature will cause denaturation or too low below optimal temperature will cause a decrease in reaction rates and will eventually halt. It can be pH because enzyme's will denature if raised above or below optimal pH. It can be substrate concentration because of high levels of substrates will increase reaction rates to a point, however when becomes saturated, the reaction rate will become unaffected. Also, it can be inhibitors because of an agent that slows or interferes with a chemical action.

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The correct answer to this question would be c