In an experiment, $5c{m^3}$ of 1 % salivary amylase are added to $100c{m^3}$ of different concentrations of starch.
Which graph shows the results of plotting the initial rate of reaction $\left( {y - axis} \right)$ against the
concentration of substrate $\left( {x - axis} \right)$?

A
2 )
B
3 )
C
4 )
D
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