I don't know how accepting offers works these days. We have a bit of an issue in that DC's favourite has a lower offer than their second choice (they should have no problem obtaining either set of marks), but presumably they can only accept one and they have to do that by 4 May.
DH is very very hung up on not wanting DC to go to first choice, mostly because it's in London and he says he really regrets staying in London for his degree and he's on a (probably fruitless) quest to persuade them to go to second choice. Personally I don't think his feelings about it are DC's problem and they do have several valid reasons for choosing it.
Does accepting #1 make going there an inevitability? I have no problem with it but DH would probably feel happier and complain about it less if he feels DC hasn't ruled out #2.