The correct matching is as follows:
- A. Lyman series corresponds to the UV region (II) as it involves transitions to the \( n=1 \) energy level.
- B. Balmer series corresponds to the Visible region (IV) as it involves transitions to the \( n=2 \) energy level.
- C. Paschen series corresponds to the Infrared region (III) as it involves transitions to the \( n=3 \) energy level.
- D. Pfund series corresponds to the Infrared region (I) as it involves transitions to the \( n=5 \) energy level.
The Correct Answer is: \( A - II, B - IV, C - III, D - I \)