The capacity of a normal person's working memory __________.

A) depends substantially on what particular type of items is in store
B) is practically unlimited
C) is limited primarily by the capacities of the long-term storage system
D) is roughly seven items

Research has shown that the capacity of a normal person's working memory is limited to roughly seven items, with some variation between individuals. This is known as Miller's Law, or the "Magical Number Seven, Plus or Minus Two." While the type of items stored in working memory can affect its performance, the capacity limit remains relatively consistent. The long-term storage system is not considered a primary limiting factor in working memory capacity.