Which One of the Following Scenarios Reflects the Typical Duration

Which one of the following scenarios reflects the typical duration of working short-term) memory?

A) Arnie's family spends a summer at his grandmother's house and is able to remember his grandmother's telephone number for the two months he is there. However, he quickly forgets the number after he moves back home again.

B) Barney looks up the correct spelling of the word fossil 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.
C) Carol remembers most of the information that 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) At 9:00 A.m., Darrell makes a mental list of the five items he needs to purchase at the grocery store at the end of the day. At noon, he checks himself and realizes that he still remembers all five. At 3:00 p.m., however, he discovers that he has forgotten three of the five items.