Final answer:
Radium mimics calcium in the body, and is thus transported to the skeleton, where it can stay for a long time due to its lengthy half-life causing potential health issues.
Step-by-step explanation:
Radium is transported to the skeleton primarily because it behaves similarly to calcium within the body. The option that explains this phenomenon best is option C) Radium reacts similarly to Calcium. When radium enters the body, often due to ingestion or inhalation, it is mistaken for calcium by the body's metabolic systems and consequently guided to the bones and teeth, where calcium typically accumulates.
Once there, radium can remain for a long period due to its lengthy half-life, causing health issues such as anemia and bone cancer, making radium exposure something to be avoided where possible.
Learn more about Radium and calcium