Government official: Before 1972, the first four digits of a person’s Social Security Number (SSN), known as the area number, corresponded to the location where the SSN was assigned. Each Social Security office has its own unique code. Therefore, whenever two people have SSNs with the same first four digits, and the SSNs were issued before 1972, they must have received their SSNs from the same office.
Which of the following, if true, would most strengthen the official’s argument?