Final answer:
The ellipse with foci at (-2,0) and (2,0) is a circle.
Step-by-step explanation:
An ellipse is a closed curve such that the sum of the distances from a point on the curve to the two foci is a constant. If the distances are equal, then the ellipse is a circle. In this case, the foci are located at (-2,0) and (2,0), which means the distances are equal, making it a circle. Therefore, the correct answer is C) Circle.