Given the conic section:
You can identify that it has this form:
That is the form of the Equation of an Ellipse.
By definition, the coordinates of the foci of an ellipse are:
Where:
In this case, you can identify that:
Therefore, you can find "c":
Notice that, in this case:
Therefore, the coordinates of the Foci are:
Hence, the answer is: Option B.