I voted other.
I'm not usually hitting the food court with kids but do occasionally with other adults, so have ended up casting a desperate eye around looking for space.
If there are ways to accommodate me and my companions without disturbing other diners, then I do that. For example, add an extra chair to a table or move two tables together. If I need to borrow a chair from another occupied table, I ask first.
If there is absolutely nowhere else to sit, I might ask the solo diner if it's ok to share their table but be prepared to take no for an answer. I'd be more likely to ask someone who seems close to finishing their meal.
No way would I ask someone else to move so I could be seated. That seems rude. My response as a solo diner would be a flat no.
If I was the solo diner being asked to share, I'd be less likely to say yes if there were other tables free. Plus, some days I've had as much interaction as I can deal with and just need a few quiet moments to collect myself.
Also much less likely to say yes to someone with kids, unfortunately. Too many bad experiences with misbehaving kids in food courts and fast food courts to want that happening at the same table where I'm trying to have a quiet meal. No way of telling till it's too late so I tend to err on the side of caution.
Also less likely to say yes to someone who made me feel uncomfortable.
If I was almost done with my meal, I'd be more likely to say yes.