Concept:
India's folk traditions are deeply rooted in regional culture, music, and seasonal festivities.
Step 1: Matching the Traditions to States.
• A. Lavani $\leftrightarrow$ II: A popular folk dance/song genre of Maharashtra, known for its powerful rhythm and traditional attire (Nauvari saree).
• B. Heer $\leftrightarrow$ IV: A traditional folk song genre of Punjab, most famously associated with the tragic romance of *Heer-Ranjha*.
• C. Jatra $\leftrightarrow$ I: A popular folk theatre form in West Bengal and Odisha, historically involving traveling performance troupes.
• D. Bihu $\leftrightarrow$ III: The most important folk festival and dance of Assam, celebrated to mark the changing seasons and harvest.
Step 2: Conclusion.
The correct matching is A-II, B-IV, C-I, D-III.