Which one of these doors seeems to be the most promising?

I had to choose between "seem" and "seems" which I know "seems" is correct, but I also had to say what the subject was.
Is it "these" because "doors" was incorrect. Please explain...thanks

5 answers

The first thing we should do is get rid of the prepositional phrase. Subjects, verbs, and objects are never in prepositional phrases.

That leaves:
Which one seems to be the most promising?

Now do you see the subject?
"One"....right?
Right.
Thank you Ms. Sue...I appreciate your time
You're very welcome, Cassie.