Final answer:
Dental stone or dental stone plaster is the best material choice to make a mold of a tool mark at a crime scene.
Step-by-step explanation:
The best material choice for making a mold of a tool mark at a crime scene is dental stone or dental stone plaster.
These materials have properties that allow for accurate and detailed replication of marks.
They are also durable, making them suitable for preservation and analysis in a forensic laboratory.
When making the mold, it is important to ensure that the material fully captures the impression, including the ridge patterns and surface details of the tool mark.