Telephone Numbers Are Organized into Groups of Numbers: the Area

Telephone numbers are organized into groups of numbers: the area code, the first three digits, and the last four digits. According to the stores model, this is because

A) the executive processor needs groups of numbers in order to remember information.
B) short-term memory can only hold a limited number of chunks.
C) there are limited nodes and links in our network.
D) there is a limited amount of information that can be activated in our memory at one time.