Why was entropy so low "before the big bang"?

Question

What caused the low entropy state at the beginning of our universe?

Answer 1

Well, *before* the Big Bang, there was nothing - entropy depends on mass, volume, and energy - and none of this existed before the big bang occured.

Answer 2

Because of the small volume of the universe, there were fewer microstates into which energy was distributed.  The more possible microstates available for energy, the larger the entropy.

Answer 3

  Before the big bang it didn't exist entropy began to increase when matter began to emerge.