Step 1: About the author and work.
Prabodh M. Sangma is a well-known Garo author who contributed significantly to modern Garo literature. His novel Gronggrika stands as one of the most notable works in Garo fiction.
Step 2: Context of the question.
The question refers to the institution associated with Prabodh M. Sangma, particularly during the creation or educational context of his famous work Gronggrika.
Step 3: Analysis of options.
- (1) St. Mary’s College: Not linked to Prabodh M. Sangma’s academic background.
- (2) Lady Keane College: Primarily associated with other authors.
- (3) St. Edmund’s College: Correct; this is the institution linked to the author’s educational and literary background.
- (4) Union Christian College: Not related to the author’s studies or literary environment.
Step 4: Conclusion.
Thus, the correct answer is (3) St. Edmund’s College.