Here, $\frac{5^2\times 14+1450}{5}=1998÷x$

We apply the bodmas rule to solve this expression

$$\begin{gathered} \Rightarrow \frac{350+1450}{5}=1998÷x \\ \Rightarrow \frac{{\displaystyle 1800}}{{\displaystyle 5}}=1998÷x \\ \therefore x=5.55 \end{gathered}$$

Hence, Option A is correct.