You need to reset a user password on Mac but you can’t log in.

When a user cannot log in and has started the Mac in macOS Recovery, Apple provides a password-reset workflow through Terminal. From the Utilities menu, open Terminal, type the command `resetpassword`, and press Return. This launches the Reset Password assistant, where the user can follow the available recovery steps and create a new login password. Therefore, option B is correct; the command is properly written as `resetpassword` without a space. The `passwd` command is not the Apple-documented Recovery workflow for this scenario. Disk Utility is used primarily for storage and file-system tasks, and changing Secure Boot settings does not reset a local user password. The Recovery password assistant is specifically designed to handle forgotten or unusable Mac login passwords when normal sign-in is unavailable.

================