18 Feb 2022
When you repeat the process, you don't choose a new player. The same player sacrifices each of the three permanents, if able.
18 Feb 2022
You repeat the process for an enchantment and a planeswalker whether the target opponent was able to sacrifice a creature or not.
18 Feb 2022
The target opponent doesn't choose whether to sacrifice a creature or not, although they do choose which creature they control to sacrifice.