A deep-copy copy constructor creates a new list that

• A. Shares nodes with the original
• B. Duplicates nodes so the two lists are independent
• C. Copies only node values but shares structure
• D. Copies nothing and leaves an empty list

Answer: (B)

A deep-copy copy constructor creates a new list by duplicating every node in the original, so the two lists have separate nodes in memory. Each node in the new list is a new object with the same value and the same linkage pattern, but it’s not the same node as in the original. This means operations on one list won’t affect the other because there are no shared references between them.

That’s why the correct choice describes two lists that are independent and do not share nodes. If nodes were shared, or only the values were copied while keeping the same links, or if nothing was copied at all, the resulting list wouldn’t be a true deep copy.