You can see that is a ellipse
so the equations with the signs (-) cant be because they are hyperbolas.
So that eliminates B and C.
It would be an ellipse :
horizontal ellipse:
x^2/a^2+y^2/b^2=1
where 2a is length of major axis
2b is minor axis
thus
a = 10 , b=8
x^2/100 + y^2/64=1
