Step 1: Identifying the author.
"Khapangni Mari" is a literary work by Prabir Kumar Debbarma.
Step 2: Analyzing the options.
- (1) Prabir Debbarma: This is incorrect; it's not the right author for this work.
- (2) Prabir Kumar Debbarma: Correct, he is the author of "Khapangni Mari".
- (3) Prabir Murasing: Incorrect, not the author of this work.
- (4) Prabir Kumar Murasing: Incorrect, the last name doesn't match with the author of the work.
Step 3: Conclusion.
The correct answer is Prabir Kumar Debbarma.