Which best describes the underlined word in the sentence? . throughout history, people around the world have observed the sky.. a.. simple subject. b.. complete subject. c.. compound subject.

The underlined word in this sentence is people. People is a simple subject because it the sentence is only composed of one subject. People is a group word that describes numerous subjects as one. Among other words like this are tribe, team, and others. Hence the answer is A. simple subject.

She will make lunch and Sam ran fast are the complete sentences.  They all have a subject, a predicate, and an object (whether direct or indirect).