Stuff, meaning matter-mass-energy, was always around—since that is the natural state of affairs.
A Balance of Nothing; all entities must sum to zero.
Big Bang. Explosion and expansion from a really tiny point.
quantum fancy. Possibilities evolving—mammal consciousness appears, real-izing this universe.
Wild. The Infinite radiates to the CBR antenna which broadcasts a holographic virtual reality.
Consciousness is the All.
String theory.
God did it.
Multiple universes occur. Ours had the right stuff.
None of the above.