RRB Non-Technical Popular Categories (NTPC) Practice Exam 2026 - Free NTPC Practice Questions and Study Guide

The policy tests how Britain expanded its influence through alliances that limited a local ruler’s sovereignty in exchange for British protection. Subsidiary Alliance is a system where a princely state agreed to host a permanent British-armed force, pay for its maintenance, and cede control of its defense and foreign affairs to the British, often with a resident from Britain in the state.

This approach was introduced by Lord Wellesley, who was Governor-General of India from 1798 to 1805. He used it to curb French influence and to extend British control gradually by binding neighboring states to Britain through these treaties with military and financial obligations. The other administrators listed did not initiate this policy.

So the reason this is the correct choice is that Lord Wellesley articulated and implemented the Subsidiary Alliance system during his tenure, making him the one who introduced it.