Should I use "is" or "are" in this sentence?
The next canonical choice [is/are] the so-called slip boundary conditions...
I've struggled to find an answer for this question elsewhere.
I think that "is" is correct here, since the object of the sentence, the "canonical choice", is singular, thus we use the singlular form, "is". However, it doesn't quite sound right when combined with the plural "boundary conditions". Should the form of "is" (singular or plural) depend on the "choice" or the "conditions"?
N.B. If there is a name for this kind of sentence or for parts of this kind of sentence, I'd be grateful if someone could tell me (so that it is easier to find information about them in future).