Local phone numbers in the United States are seven digits long because:
a. most people can transfer seven digits into long-term memory instantly, bypassing short-term memory.
b. the short-term memory capacity of most people is between five and nine units of digits.
c. sensory memory for numbers is very expansive and can handle such large quantities of digits.
d. when polled, early phone customers requested this many digits in their phone numbers.
b. the short-term memory capacity of most people is between five and nine units of digits.
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