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The variation of decay rate with number of active nuclei is correctly shown in graph
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A
By law of radioactive decay
$$
-\frac{\mathrm{dN}}{\mathrm{dt}} \propto \lambda \mathrm{N}
$$
$\mathrm{N}$ is the number of radioactive nuclei in the sample
So, $\frac{\mathrm{dN}}{\mathrm{dt}}$ can be negative
The variation of decay rate with number of active nuclei is shown by the graph
$$
-\frac{\mathrm{dN}}{\mathrm{dt}} \propto \lambda \mathrm{N}
$$
$\mathrm{N}$ is the number of radioactive nuclei in the sample
So, $\frac{\mathrm{dN}}{\mathrm{dt}}$ can be negative
The variation of decay rate with number of active nuclei is shown by the graph
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