Guessing A is the best pick. Champions act as a bridge to validate whether actual user needs are being addressed, especially when users are hesitant about change. B seems like a trap since exec KPIs don’t guarantee end user satisfaction. Pretty sure about this, but open to other views if you think otherwise.
I don’t think interviewing execs (B) really gets at what end users actually need here. A is stronger since a champion can relay concerns and help validate if the new setup is working for the real users, not just management. Option C seems like a distraction, mostly technical focus. Pretty sure A fits best but happy to hear if anyone feels differently.