The inclusion of in evidence photographs enables the viewer of the photo to get a sense of the size of the object used at the crime scene a. sketching b. markers c. color indicators d. margins

The inclusion of markers in evidence photographs enables the viewer of the photo to get a sense of the size of the object used at the crime scene.
Evidence identification markers are items that are used to mark and illustrate items of evidence at a crime scene, it will allow others an easy to understand assessment of the scene showing the location.

Monophony.  hope this ! : )