Why Can't the Moon Always Pass Through the Center of the Umbra

Multiple Choice

Why can't the Moon always pass through the center of the umbra?

A) The Moon's rotation is slightly faster than its revolution around Earth.
B) The Moon's orbit is inclined by 5 degrees to the plane of Earth's orbit.
C) The Moon's synodic cycle changes a few minutes per cycle.
D) The Moon's orbit changes with the seasons.
E) The Moon is not in its full moon lunar phase.