Bill Zebub
“It’s probably Matt Mercer’s fault.”
a) something like "my prep says this a rusted portcullis sealed shut with age. It's a DC18 strength check to slam it up, or with a DC15 passive perception (or active check) the party can spot a lever in the corner. It's a DC15 strength check to snap it up"
So i wouldn't have a passive check for the lever. If the pass the passive check...which doesn't involve a decision...then it's obvious what the right decision is. So the player has never made an trade-offs.
What I might do is say that if the player uses a combat round searching for "a better option" they definitely find the lever. But probably not, because there's no information to suggest that might be a good plan. So not sure here.
b) "uhhh, yeah cool - you want to what, try and lever it up? what's your strength again? 20? heck ya, that thing can't stop you. You heft it up and off you go, the owlbears in pursuit."
In general I might say something like this, but because the stakes are so high it's a missed opportunity to have some decision-making and excitement.
But even in this high stakes scenario if I can't think of something, or haven't prepared something, that gives the player an interesting decision to make I might just go with it.
c) "um, yeah, ok, roll athletics (mentally uses the default DC15 for standard checks)"
No. I would state the DC so they can decide whether to use a round doing this.
d) "Right, you skid to a halt in front of the gate - you can hear the owl bears bellowing as their claws skid off the stone floor. ....oh, yeah, ok so you see the gate and what might be some old machinery in the corner? ok yeah, looking close at the machinery you can see its like old levers and stuff - probably to seal the gate from this side. rusty as heck. Yeah, you can totally see if that lever will open, um - strength check please? but they're going to be on you in a second if you fail."
Again, I would want some kind of tradeoff. You can try to lift the gates with probability X before the owlbear gets to you, or you can use the machinery with a higher probability of success but it will take longer.
e) "Right, yeah, roll +STR but I'll tell you right now an obvious consequence if you don't pick "it doesn't take long" they're gonna be on you."
Dungeon World approach. This works for me.