The following data were obtained in a study of an enzyme known to follow Michaelis-Menten kinetics:

V₀ (μmol/min) Substrate added (mmol/L)
217 0.8
325 2
433 4
488 6
647 1,000

The Km for this enzyme is ap
A) 1 mM.
B) 1000 mM.
C) 2 mM.
D) 4 mM.
E) 6 mM.