The ration 43.5 : 25 is the same as = ?

Answer: Option A

$$\begin{array}{rl}& 4^{3.5}:2^5\\ & ={\left(2^2\right)}^{3.5}:2^5\\ & =2^{2\times 3.5}:2^5\\ & =2^7:2^5\\ & =2^2.2^5:2^5\\ & =2^2:1\\ & =4:1\end{array}$$