The Computer Fraud and Abuse Act (CFAA) primarily protects against unauthorized access to computers and computer networks, as well as various forms of computer-related fraud and abuse. Among the options provided, the behavior that the CFAA would most directly protect against is:
a person in another state accessing their bank account
This is because accessing a bank account without authorization would be unauthorized access to a computer system, which falls under the provisions of the CFAA. The other options, while they may involve illegal activities, do not directly relate to the unauthorized access or abuse of computer systems as defined by the CFAA.