Step 1: Understanding the match.
- Quantum wells are one-dimensional structures, so they have delocalization in 1 dimension, matching with (I).
- Quantum wires are two-dimensional structures, matching with (II).
- Quantum dots are zero-dimensional structures, matching with (III).
- Bulk conductors are typically considered as having zero delocalization in terms of quantum dimensions, matching with (IV).
Step 2: Conclusion.
Thus, the correct match is option (2).