Step 1: Understanding Chalcopyrite and Siderophilic Behavior.
A chalcopyrite element tends to concentrate in metallic ores, particularly copper-based ores. A siderophile element, on the other hand, is one that has an affinity for iron and tends to be found in metallic iron.
Step 2: Analyzing the Options.
- Fe (Iron) is a siderophile element, meaning it has a strong affinity for metallic iron and is concentrated in Earth's core.
- Mg (Magnesium) and Li (Lithium) are not considered siderophile elements.
- Pb (Lead) is not a chalcopyrite or siderophile element.
Thus, the correct answer is (B) Fe.
Final Answer:
\[
\boxed{\text{Fe}}
\]