Why Is the Universe Expanding

Why is the universe expanding?

A) The energy from all the stars is heating the universe, making it expand like a gas that is heated.
B) Spacetime itself is expanding, carrying the galaxies (or superclusters of galaxies) with it.
C) The universe is not expanding-it is we who are getting smaller, making the universe seem bigger and bigger.
D) An infinitely dense clump of matter exploded, sending the galaxies (or superclusters of galaxies) hurtling out through space.

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