Step 1: Understanding the Concept
Metals pack in different lattices such as bcc, fcc and simple cubic.
Step 2: Silver
Silver crystallises in a face-centred cubic (fcc) lattice, also called cubic close packed.
Step 3: Compare the options
The answer is FCC, option (B).
Final Answer:
Silver forms a face-centred cubic unit cell.
\[ \boxed{\text{(B) }\text{FCC}} \]