Who introduced the Subsidiary Alliance in Awadh (1801)?

Lord Wellesley

The correct answer is Option (3) → Lord Wellesley

Subsidiary Alliance was a system devised by Lord Wellesley in 1798. The Subsidiary Alliance had been imposed on Awadh in 1801. By the terms of this alliance the Nawab had to disband his military force, allow the British to position their troops within the kingdom, and act in accordance with the advice of the British Resident who was now to be attached to the court. Deprived of his armed forces, the Nawab became increasingly dependent on the British to maintain law and order within the kingdom. He could no longer assert control over the rebellious chiefs and taluqdars.