The ratio of 252.5 : 53 is same as = ?

Answer: Option D

$$\begin{array}{rl}& 25^{2.5}:5^3\\ & (5{)}^{2.5\times 2}:5^3\\ & 5^5:5^3\\ & 5^3.5^2:5^3\\ & 5^2:1\\ & 25:1\end{array}$$