Ans: C
The length in the map $:$ the actual length
The length in the map $:$ the actual length
$\begin{array}{cl}
& 1:8~000 \\
= & 1\text{ cm} : 8~000\text{ cm}
\end{array}$
$\therefore$ the area in the map $:$ the actual area
$\begin{array}{cl}
= & 1\text{ cm}^2 : 64~000~000 \text{ cm}^2 \\
= & 2 \text{ cm}^2 : 128~000~000 \text{ cm}^2 \\
= & 2 \text{ cm}^2 : 12~800 \text{ m}^2
\end{array}$
Therefore, the actual area of the park is $12~800\text{ m}^2$.