Step 1: Concept Clarification
This question requires associating harvest festivals from List-I with the Indian states in List-II where they are predominantly observed.
Step 2: Detailed Breakdown
Each festival must be matched with its corresponding state:
(A) Nabanna is a harvest festival observed in West Bengal. Thus, (A) aligns with (III).
(B) Onam is Kerala's primary harvest festival. Consequently, (B) matches with (I).
(C) Pongal is a multi-day harvest festival celebrated in Tamil Nadu. Therefore, (C) aligns with (IV).
(D) Magh Bihu (also known as Bhogali Bihu) is a harvest festival observed in Assam. Hence, (D) matches with (II).
Step 3: Constructing the Correct Match
The accurate pairings are as follows:
A - III
B - I
C - IV
D - II
This combination corresponds to option (C).
Step 4: Conclusive Answer
The correct association is (A) - (III), (B) - (I), (C) - (IV), (D) - (II).