You Are at the Scene of a Fire and Recognize

You are at the scene of a fire and recognize a burned folded piece of dry paper believed to be a threatening letter from the suspect to the homeowners. What is the best action to take to preserve and collect the item?

A) Open it, photograph and place it in a clean paint can and transport to lab
B) Open it, photograph and place it in paper bag and transport to lab
C) Photograph the document as it was found, place it in a plastic bag or sheet protector and transport it to lab.
D) Photograph it as it was found, open it, photograph again and transport as is to lab