In this sentence, "which lasted two hours" is an adjective clause because it describes the school play by telling how long it lasted. Also, adjective clauses often start with words such as "who", "that", "which", or "when", along with others.
The topic sentence introduces the reader to what you will talk about.
B. They announce the main ideas of paragraphs
In Of Plimoth Plantation the characteristic of the authors writing style that is most evident would be "<span>Emotional Understatement" since the issue at hand is of course more serious. </span>