One of the History Teachers Below Is Violating a Principle

One of the history teachers below is violating a principle recommended for teacher-directed instruction. Which one?

A) Mr. Annenberg explains to his students how the American Revolution was in some ways similar to conflicts children have about ownership and rights.
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) During a unit on World War I,Mr. Cortez often uses maps to show how certain battles were fought at especially strategic locations.
D) Ms. DeLuca talks quickly to cover the battles of World War II because the class time is about to end.