I'm also pushing for option D because in the event of some apocalyptic scenario the 9th avenue station will serve as a refuge for all us inner-city latte sippers that can get to it quickly while the rest of you on your 10 minute commutes to Airdrie are sacrificed in the hellfire/explosion/wrath of god etc.
I was looking over the reports yesterday that were before the committee, particularly the report from Stantec that described and showed the elevated system option. What I saw did not thrill me, you would end up with the equivalent of a concrete ceiling above the street 3-4 storeys up. That is a complete non-starter for me, sure you can argue that a lot of those sidewalks are already in shadow due to the skyscrapers, but that is not justification enough to putting up a barrier like that over your head.
So I am still pushing for option D for the project, but if that was to be a no go I'd have to pick B and have the tunnel through the core section before the bridge.