What is sugaulitrety when was sugauli trirty establist

Sugauli treaty was a treaty that defined the borders of Nepal after its expansion to other territories and conflicts with other countries aroused. It was established on the 2nd of December 1815.

Explanation:

The Sugauli treaty established the borders of Nepal after conflicts with the East India Company took place. Nepal and the East India Company signed a treaty that defined the limits of Nepal. As a consequence, Nepal lost some of its territories. The Sugauly treaty was signed on December 2, 1815, and ratified on March 4, 1816.

it should be d or b but i'm sure it's d