Which conclusion about enzyme activity is best supported by these data?

Which conclusion about enzyme activity is best supported by these data?
A. Enzymes remain active indefinitely once they reach the highest environmental temperatures.
B. Enzymes perform best within a specific temperature range.
C. Enzymes adapted to extreme environments catalyze reactions at the same optimum temperature as human cells.
D. Enzymes must be part of a larger protein complex to function optimally.