The target is to be $\"\"$ wide and $\"\"$ high.

In this case the ellipse is horizontally oriented

Standard form of horizontal ellipse is $\"\"$ ,

where $\"\"$ is center, $\"\"$ is length of semi major axis and $\"\"$ is length of semi minor axis.

Find the values of $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

$\"\"$ .

Therefore, the equation is $\"\"$ .

Option C is correct.