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

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.

Yes, the subject in this sentence is "doors," not "these." The word "seems" is the correct form to use because "doors" is a plural noun. When choosing between "seem" and "seems," you need to match the verb with the subject in terms of number. Since "doors" is plural, the correct form is "seem." Therefore, the sentence should be: "Which one of these doors seems to be the most promising?"

To determine the subject of a sentence, you need to identify the noun or pronoun that the verb is referring to. In this case, the verb "seems" is referring to which door is the most promising. Therefore, the subject is "doors" because it is the noun being described by the verb "seems."