Phase 1: Conceptual Grasp
This task involves correlating harvest festivals from List-I with their primary celebration states in List-II.
Phase 2: Detailed Elaboration
Each festival must be matched to its respective state:
(A) Nabanna, a harvest festival, is observed in West Bengal. Thus, (A) aligns with (III).
(B) Onam, the prominent harvest festival of Kerala, corresponds to (I).
(C) Pongal, a multi-day harvest festival, is celebrated in Tamil Nadu. Consequently, (C) matches (IV).
(D) Magh Bihu (also known as Bhogali Bihu), a harvest festival, is observed in Assam. Therefore, (D) pairs with (II).
Phase 3: Assembling the Correct Sequence
The resultant pairings are as follows:
A - III
B - I
C - IV
D - II
This configuration aligns with option (C).
Phase 4: Conclusive Determination
The accurate correspondence is established as (A) - (III), (B) - (I), (C) - (IV), (D) - (II).