Question

Select the correct description for the words in bold. melinda and​ belinda, her twin sister​, have survived three car​ accidents, a housefire​, a​ hurricane, and a tornado.

Answer 1

A compound subject occurs when two or more separate words joined by a coordinating conjunction constitute the subject.​

Answer: Compound Subject

Answer 2

The correct answer is complete subject.
Assuming that the words in bold are Melinda and Belinda, her twin sister, then the answer is complete subject. A complete subject includes not only the actual subject of a sentence, but also all words directly connected to it (such as her twin sister). If only Melinda and Belinda were bolded, then it would be a compound subject (consists of more than one subject).