"Is A or B inevitable?" or "Are A or B inevitable?" ?

[Chaotica]

Title says it all really - please advise. Thanks!

(Am having a debate with an editor about it.)

Is A or B

Are A and B

is how I'd say it... hmmm....

Is?
I think?

Is.

Is feels right.

But not sure why.

Is.

Since it is a choice, A and B are each singular.

Hmmmm. Depends on your meaning, I think.

'Is A or B inevitable' means is either one of them inevitable, so you're asking whoever answers to choose one of the two to be inevitable.

'Are A or B inevitable' works if you mean that both of them could be, or one of them, or neither, iyswim. But the meaning is less clear.

IMHO.

The "or" makes it singular. If the or was an and it would be plural. So it's an IS.

Which side were you on?

Is there a choice of either A or B, or could you have both of them?

Is

Many thanks to all. I was on the 'is' side too.

(Oddly, the editor sees it the opposite way around from me so it's good to have opinions, especially in my favour...)

It is just about possible to have both at once (inclusive 'or') but 'is' still sounds OK:
'Is A, or B, or both A & B inevitable?' I don't intend to be that long winded about it though.

Is

oops: "long-winded" is what I mean

Is
But can you write around? It does read a little awkwardly despite being correct.

Is, but "are" is what you'd prbly say when you're talking

Definitely is.