Before its formation as a district, Lakhisarai was a part of which district of Bihar?

The correct answer is: D. Munger

Before its formation as a district, Lakhisarai was a part of Munger district. It was carved out of Munger district on 12 October 1972.

Araria, Katihar, and Purnea are all districts in Bihar that are located to the north of Lakhisarai. Munger is located to the south of Lakhisarai.