Step 1: Recall major historical earthquakes in Bihar–Nepal region.
The most devastating event associated with Bihar is the Bihar–Nepal earthquake, well known in Indian geography and disaster-history texts.
Step 2: Pin the exact year.
This earthquake struck on 15 January 1934, with magnitude $\approx 8.1$, causing massive damage in north Bihar.
Step 3: Eliminate options by fact check.
1931, 1932, and 1933 do not match the documented Bihar–Nepal event; 1934 does.
Step 4: Conclusion.
Hence, the year is (D) 1934.