Crystal structures: identify elements with HCP (hexagonal close-packed) lattice Select the correct set for HCP among the given choices. Choose the correct option.

Concept
Typical HCP metals: Zn, Mg, Cd, Co, Ti, Zr, etc. However, antimony (Sb) and bismuth (Bi) are rhombohedral, not HCP. The other sets list FCC (option b) and BCC (option c) metals.

Option check
• (a) includes HCP members (Zn, Mg, Cd, Co) but incorrectly adds Sb and Bi → set is not purely HCP.
• (b) FCC set (γ-Fe, Al, Cu, Pb, Ag, Ni).
• (c) BCC set (α-Fe, W, Cr, Mo).
Thus, the only correct choice is “None of the above.”

Final Answer
None of the above