Final answer:
The most radiopaque post listed is Titanium, which is known for its strength, biocompatibility, and visibility on X-rays; other materials like Zirconia are also radiopaque, but less so than Titanium.
Step-by-step explanation:
The radiopacity of various posts used in dental practices is an important consideration for proper dental imaging and restorative dentistry. Radiopacity refers to the ability of a material to prevent X-rays from passing through it, appearing white or light on a radiograph. The most radiopaque option among the list presented is B. Titanium. Titanium is widely known for its excellent properties, including high strength, biocompatibility, and its radiopaque nature, making it readily visible on X-rays. In contrast, Zirconia also has good radiopacity but is generally less radiopaque than titanium, while carbon fiber and plastic are much less radiopaque and may not be as clearly visible in dental X-rays.