Step 1: Understanding Subsidiary Alliance.
The Subsidiary Alliance was a political system introduced by the British to expand their influence over Indian princely states. Under this system, Indian rulers accepted British troops within their territory and agreed to follow British guidance in foreign affairs.
Step 2: Role of Lord Wellesley.
Lord Wellesley, who served as Governor-General of India from 1798 to 1805, introduced the Subsidiary Alliance system. Through this policy, many Indian states came under British control without direct annexation.
Step 3: Analysis of other options.
- (A) Doctrine of Lapse -- Lord Canning: Incorrect. The Doctrine of Lapse was introduced by Lord Dalhousie.
- (B) Subsidiary Alliance -- Lord Wellesley: Correct. This policy was implemented by Lord Wellesley.
- (C) Arms Act -- Lord Curzon: Incorrect. The Arms Act was passed during the time of Lord Lytton.
- (D) Vernacular Press Act -- Lord Dalhousie: Incorrect. The Vernacular Press Act was introduced by Lord Lytton in 1878.
Step 4: Conclusion.
Thus, the correctly matched pair is Subsidiary Alliance -- Lord Wellesley.
Final Answer: Subsidiary Alliance -- Lord Wellesley.