(a) archaeological excavations
(b) establishment of English Press in Colonial India
(c) establishment of Churches in Princely States
(d) construction of railways in Colonial India
Alexander Rea, A. H. Longhurst, Robert Sewell, James Burgess and Walter Elliot were all archaeological surveyors in India. They were responsible for the excavation and preservation of many ancient Indian sites.
Therefore, the correct answer is (a).
Inputs from IAS EXPRESS's History (Optional) Mindmap Notes