Explanation

The correct option is D (The Charter Act of 1833).

• Re-designation of the Post: The Charter Act of 1833 elevated the Governor-General of Bengal to the Governor-General of India, vesting in him complete civil and military powers.
• First Governor-General of India: Lord William Bentinck became the first Governor-General of India under this Act.
• Centralization of Legislation: The Act deprived the Governors of Bombay and Madras of their independent legislative powers, granting exclusive legislative authority for British India to the Governor-General in Council.
• Commercial End for EIC: It completely terminated the commercial activities of the East India Company, turning it into a purely administrative body.