Who had merged Sikkim in India?

1. A

   Lord Hastings

   (a) Lord Hastings. Hastings (1813–23) fought the Anglo-Nepal war and signed the Treaty of Titalia (1817) restoring Sikkim as a British ally—restoration, not the annexation keyed here.

2. B

   Lord William Bentinck

   (b) Lord William Bentinck. Bentinck’s years (1828–35) took Darjeeling by grant (1835) from the Chogyal; that is a hill-station cession, not merger of Sikkim as a whole.

3. C

   Lord Dalhousie

   (c) Lord Dalhousie. Among the four Governors-General on the list, the Commission keys Dalhousie (1848–56) for British territorial seizure from Sikkim (1850 terai annexation after the 1849 outrage). Official key.

4. D

   Lord Auckland

   (d) Lord Auckland. Auckland (1836–42) is the First Afghan War name, not the Sikkim-annexation name on this paper.

Summary. Official key is (c) Lord Dalhousie. The question’s four names are all Company Governors-General; the keyed choice is Dalhousie, whose term saw the 1850 annexation of Sikkim’s terai after the Campbell–Hooker episode. Hastings restored Sikkim in 1817; Bentinck’s Darjeeling deed is 1835; Auckland is off-map. Do not swap this Company-era key with the 1975 statehood merger.