You Want to Order a Pizza and Need to Pay

Multiple Choice

You want to order a pizza and need to pay with a credit card. You glance at your credit card number and then put the card back into your wallet. When it comes time to pay, you can only remember the first four numbers. Which of the following provides the best explanation as to why?

A) Working memory is limited to 15 items, and your card has 16 digits.
B) Your credit card number is mostly fours and twos and you get confused.
C) The pizza delivery guy keeps talking while you are rehearsing the digits.
D) Working-memory capacity is reduced because you have to hold the phone.