Of the following, which is greatest?

Of the following, which is greatest?

A. $\left(\dfrac15\right)^{-2}$

B. $\left(\dfrac13\right)^{-2}$

C. $3^{-2}$

D. $5^{-2}$

E. $2^3$

Answer: A

Source: GMAT Prep

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