One of the History Teachers Below Is Violating a Principle

One of the history teachers below is violating a principle recommended for promoting long-term memory storage during instruction. Which teacher is doing so?

A) Mr. Annenberg explains to his students how the American Revolution was an almost inevitable outcome of certain English policies at the time.
B) Ms. Bartholomew begins her discussion of the American Civil War by drawing some parallels between it and something the class has already studied-the American Revolution.
C) At the beginning of a unit on World War I, Mr. Cortez gives his students several questions they should be able to answer at the end of the unit.
D) Ms. DeLuca talks in a relaxed conversational style, describing different battles of World War II as they come to mind.