Which One of the Following Situations Reflects the Typical Duration

Which one of the following situations reflects the typical duration of working memory?

A) Arnie remembers his locker combination through the entire school year.By the end of summer vacation, however, he has forgotten it.
B) At noon, Barney makes a mental list of the five homework assignments he needs to complete that night.Midway through the afternoon he checks himself and realizes that he still remembers all five.However, by early evening he cannot recall two of the five assignments.
C) Carol remembers most of the information she has been learning about World War II in class this week, but she remembers very little of what she learned about World War I two weeks ago.
D) Darrell looks up the correct spelling of the word fossil, repeats the letters once, and closes the dictionary.By the time he finds a piece of paper on which to write the word, he has forgotten how to spell it.