The graph shows the rate of activity of the enzyme sucrase plotted against the concentration of sucrose.
Why does the rate of enzyme activity remain constant from $80-90gd{m^{-3}}$.

1 )
All the enzyme has been inhibited.
2 )
All the substrate has been used up.
The concentration of the enzyme is limiting the rate.
4 )
The concentration of the substrate is limiting the rate.
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