My guess is that it doesn’t matter a whole lot. Or that you could plead ignorance at the border if you selected the wrong one. I don’t think any of us know how much ArriveCan replaces what the agents do under normal circumstances (like ask your reason for entering Canada) and how much it pertains only to COVID-specific information. My guess is that it’s still weighted to the latter. Hence I would expect an agent to still ask “What is your reason for entering Canada” and not to glean that info from the app.

But I could be wrong…