What icon is used for attaching a file or document to an email message?

Correct option is C

The paper clip icon is universally used in email applications to represent the action of attaching files or documents. It resembles a physical paper clip, symbolizing the attachment of one item to another.

Additional Information:

• Pen icon: Usually associated with editing or writing tools.
• Smiley icon: Represents emojis or emotional expressions in emails or messaging.
• Trash can icon: Used to delete emails or items.