Which of the following will increase the reaction rate of an enzyme reaction?

Increasing the amount of substrate while leaving the enzyme amount unchanged, I hope this helps

Increasing the amount of substrate while leaving the enzyme amount unchanged.

Explanation:

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.