Which One of the Following Is the Best Example of an Advance

Which one of the following is the best example of an advance organizer?

A) Ms.Hillman tells her students, "Tomorrow we will begin a unit on the Battle of the Scheldt.We will examine the reasons for the battle, the involvement of Canadians, and the reasons for the Canadian defeat."
B) After describing the characteristics of each of the planets in the solar system, Mr.Jones gives his students a handout that shows the orbits of the planets, their distances from the sun, and their relative sizes.
C) Ms.Lawford tells her students, "On Monday we will begin a unit on how clouds are formed.Please read the next chapter in your book before then."
D) Ms.Devries writes on the board, "Tell your parents to begin thinking about a costume that they can help you make to wear for our Thanksgiving pageant in three weeks."