The correct answer is: A. It is possible to delete existing attachments while forwarding an email
When forwarding an email, it is possible to add a message or edit an existing message, and to forward multiple recipients at once. However, it is not possible to delete the existing attachment.
When you forward an email, you are essentially creating a new email that contains the original email as an attachment. The original email is not deleted, and the recipient of the forwarded email will be able to see the original email and any attachments that were included.
If you want to delete an attachment from an email before forwarding it, you will need to open the original email and delete the attachment there. You cannot delete an attachment from a forwarded email.