What was it that caused the apparent expansion of the universe?
A)our point of view, the expansion being a projection effect resulting from Earth's motion in the galaxy
B)the centrifugal force upon all matter in the universe, caused by motion around its center
C)a universal repulsive force, stronger than the gravitational attraction between matter in the universe
D)No cause has yet been found, but the expansion started suddenly and has continued to this time.

Question

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The Answer of What was it that caused the apparent expansion of the universe?
A)our point of view, the expansion being a projection effect resulting from Earth's motion in the galaxy
B)the centrifugal force upon all matter in the universe, caused by motion around its center
C)a universal repulsive force, stronger than the gravitational attraction between matter in the universe
D)No cause has yet been found, but the expansion started suddenly and has continued to this time.

What Was It That Caused the Apparent Expansion of the Universe