The Accurate Prediction of the Time and Position of a Total

The accurate prediction of the time and position of a total solar eclipse is

A) difficult because of the varying distances of Earth from the Sun and the Moon from Earth in their elliptical orbits.
B) not easy because of inaccurate knowledge of the rotation of Earth on its axis and of the revolution of Earth in its orbit.
C) difficult because the Moon's motion is unpredictable, since it is affected in a major way by the tidal ebb and flow of water on Earth.
D) relatively easy since the motions of Earth and Moon in space are predictable and accurately known.