What memory trick is used for remembering the charter dates for the 24 single letter chapters?

The correct answer relates to the use of a numerical format that corresponds to specific charter dates for each of the 24 single-letter chapters of Kappa Alpha Psi. The structure of phone numbers, particularly in the context of remembering information like dates, allows for an easy recall mechanism since each digit can represent a specific chapter's founding year or some memorable association.

Using a familiar framework, such as a phone number, makes it easier to remember sequences than if the numbers were presented in isolation, as in the other choices. It creates a mental image or format that is relatable, facilitating the memorization process.

The other options do not use a familiar structural memory aid to correlate with the charter dates, making them less effective. The combination of numbers in option A mimics real-life items that people frequently recall, thus making it a useful tool for memorizing historical facts associated with Kappa Alpha Psi’s chapters.