"sentience" and "abiliy to choose" is just your vague way of saying calculating an optimum. An electron cannot calculate the optimal position around an atom, therefore the position of an electron cannot be chosen, is what you are saying.
If X can turn out A or B, and it turns out B, then you would not call it a decision. You would call it randomness, or chance. You simply do not have a particular word for this act where one of many options comes to be the present. Or you would say it is an "event", it 'happens", but the fact that there are several ways in which it can turn out, and one is made the present, does not make it a decision for you.