Step 1: Analyze Works by Nanda Kumar Debbarma.
Identify which of the listed works are by the Tripuri author and linguist Nanda Kumar Debbarma. The works are: Ani Ganao Ang, Bubagwrasa, Kamini Ochai Kotor, and Kokthairoik kobono hayungo.
Step 2: Confirm Authorship.
All listed works—Ani Ganao Ang, Bubagwrasa, Kamini Ochai Kotor, and Kokthairoik kobono hayungo—are indeed authored by Nanda Kumar Debbarma.
Step 3: Evaluate Options.
- (1) A, B, and C: Incorrect. Excludes D, a significant work.
- (2) A, B, and D: Incorrect. Excludes C, another important work.
- (3) A and B: Incorrect. Omits C and D.
- (4) A, B, C, and D: Correct. Includes all listed significant works by Debbarma.
Step 4: Conclusion.
The correct answer is (4) because all listed works are attributed to Nanda Kumar Debbarma.