At which substrate concentration(s) did catalase function for the shortest amount of time? late nite labs

The activity of catalase is high at higher concentration of hydrogen peroxide (substrate) present in the reaction. 

Catalase is an enzyme found in living organism that catalyzes the breakdown of hydrogen peroxide to water and oxygen gas. It also protects the living cell from oxidative damage by reactive oxygen spices. However, the activity of catalase is high at higher concentration of hydrogen peroxide (substrate) present in the reaction and less time is needed for the reaction to occur.

it takes hundreds of years to become stable.

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i believe the answer would be b. hope it : )