Correct option is B. $$ 1:7$$
$$\textbf{Find the ratio of savings to expenditure.}$$
$$\begin{aligned}&\text {Ratio of savings to expenditure }=\text { Rs. } 36,000: \text { Rs. } 2,52,000 \\& \ \ \ \ \ \ \ \ \ \ \ \ \ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \ =1: 7\end{aligned}$$
$$\therefore \textbf{Option B is correct}$$.