Let $\sigma_1$ and $\sigma_2$ be the standard deviations of two distributions $D_1$ and $D_2$ respectively,and $D_1$ be more consistent than $D_2$. If the means of $D_1$ and $D_2$ are the same,then the percentage increase in the standard deviation of $D_2$ over the standard deviation of $D_1$ is:
- A$\frac{\sigma_1-\sigma_2}{\sigma_2} \times 100$
- B$\frac{\sigma_1-\sigma_2}{\sigma_1} \times 100$
- C$\frac{\sigma_2-\sigma_1}{\sigma_2} \times 100$
- D$\frac{\sigma_2-\sigma_1}{\sigma_1} \times 100$
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