in which one of the following sentences does the verb agree with the subject?
Yes, you are correct. The simple subject of a sentence is the main noun or pronoun that the sentence is about. In the given sentence, "people" is the main noun that the sentence is talking about, so it is the simple subject. To identify the simple subject, you can ask yourself "who or what is the sentence about?" In this case, the sentence is about "people," so it is the simple subject.
