Final answer:
The best material to make a mold of a tool mark at a crime scene is silicone rubber due to its precision and flexibility, which outperforms other options like plaster of Paris, natural soil, and cement. Therefore, the correct option is d) silicone rubber
Step-by-step explanation:
The best material for making an impression of a tool mark at a crime scene is d) silicone rubber. When forensics teams need to take a detailed and precise mold of a tool mark, it is essential to use a material that is capable of capturing all the fine details without disturbing the impression. Silicone rubber is a preferred choice because it is easy to mix, can be applied directly to the tool mark without requiring a release agent, and sets quickly. It is also flexible, which allows for easy removal from the tool mark without causing any damage. In contrast, plaster of Paris can be too brittle and might not capture fine details as well, while natural soil and cement are not suitable for making molds.
Comparatively, plaster of Paris sets rapidly and could be used if silicone rubber is not available; however, it is not as flexible, making it more challenging to remove without breaking the mold or damaging the tool mark. On the other hand, natural soil is not a viable option as it cannot be used to make a mold. Cement is also not appropriate for forensic use due to its rough texture and lengthy setting time, which could alter the tool mark and make the evidence unusable.