What is the meaning, if any, of the event Report write (removable media)?

What is the meaning, if any, of the event Report write (removable media)?
A . This event would never occur. App Control does not report activity on removable media.
B . A Policy’s device control setting ‘Block writes to unapproved removable media’ is set to Report Only. The event details show the process, file name, and hash modified or deleted on the removable media.
C . A Policy’s device control setting ‘Block writes to unapproved removable media’ is set to Report Only. The event details show the process and file name modified or deleted on the unapproved removable media.
D . A Policy’s device control setting ‘Block writes to unapproved removable media’ is set to Enabled. The event details show the process, file name, and hash modified or deleted on the removable media.

Answer: C