According to Kepler, what do all bodies in orbit around another have in common?

A.
All follow a circular path around a central body, which is the focal point of the circle.

B.
All follow a path tangent to a circle around a central body or focal point.

C.
All follow a spherical path that has a focus on each of two equidistant axes.

D.
All follow an elliptical path that has two foci, rather than a circular path.