When was Subsidiary Alliance devised by Lord Wellesley?

1798

The correct answer is Option 2 - 1798

Subsidiary Alliance was a system devised by Lord Wellesley in 1798. All those who entered into such an alliance with the British had to accept certain terms and conditions:

(a) The British would be responsible for protecting their ally from external and internal threats to their power.
(b) In the territory of the ally, a British armed contingent would be stationed.
(c) The ally would have to provide the resources for maintaining this contingent.
(d) The ally could enter into agreements with other rulers or engage in warfare only with the permission of the British.