What leads up to our conscious choice all exists in our present state of conscious awareness. This conscious state of awareness allows us the freedom to choose between several possible options
Nothing can lead up to anything in zero time. Why will you not even try to explain what exactly you think the "present" is? Colloquially it's totally irrelevant and exactly, it doesn't exist.
Your "present state of conscious awareness" is either the way it is entirely due to the past that led to it or not. If not, to some extent it is due to nothing that led to it, which means it must, to that extent, be random.
This isn't rocket science.
So do you presume that this and all my other replies were just inevitable reactions rather than consciously chosen words?
Both (and I'm giving you the benefit of the doubt here by assuming you're not actually a bot).