Which one is more correct grammatically speaking in English?
a) Is X and Y the exact same thing?
b) Are X and Y the exact same things?
c) Are X and Y the exact same thing?
Please state your answer for : 1) BrE and 2) AmE.
And the sources. Please :)
Also how common is it for Native English People to not follow the correct grammar pattern for this?
How often do you hear Native English speaker mistakenly saying using option a or b (whichever one is the incorrect one, which I don't know yet), even though it is incorrect?
NOTE there are two objects being mentioned here X and Y. Regardless whether they are countable or uncountable things. So there are two things, no more and no less than that.