Correct Answer:
C. Secretary of State
Explanation:
Edwin Montagu served as the British Secretary of State for India from 1917 to 1922. He is best remembered for authoring the historic Montagu Declaration (1917) and the subsequent Montagu-Chelmsford Reforms.
### Important Facts:
- Role: The Secretary of State for India was the cabinet minister responsible for the governance of the British Indian Empire.
- Key Legislation: His work led directly to the Government of India Act 1919, which introduced the system of 'Dyarchy' (dual government) in provinces.
- Viceroy Counterpart: Lord Chelmsford was the Viceroy of India during his tenure.