On the Quantine page you will see a Blue Read Me help button that contains help information about Quarantine and the same applies to all other Blue Read Me help buttons throughout BPS Pro.
In general you would want to click the View File Option in Quarantine if you are unsure about restoring the file using the Restore File Option or the Delete File Option. If everything is working fine on your website then there would be no need to restore the file and you can choose the Delete File Option.
I am not exactly what action caused the file to be sent to Quarantine so as long as everything is working fine on your site you can safely choose the Delete File Option in Quarantine to delete the file.