The Montague Chelmsford Reforms is known as

Answer: Option A

The Montague Chelmsford Reforms were introduced to increase Indian participation in the governance of British India.

Government of India Act 1919: These reforms were formalized through the Government of India Act 1919. The Act introduced a dual system of government, known as "diarchy," where certain subjects were transferred to Indian ministers at the provincial level.

The Government of India Act 1935, Government of India Act 1909, and Government of India Act 1892 are separate legislative acts with different provisions.

Thus, the correct answer is Government of India Act 1919.