Explanation:

- The Montague-Chelmsford Reforms were introduced in 1919.

- These reforms led to the Government of India Act 1919 and were aimed at increasing Indian participation in governance by introducing a system of dyarchy.

- Option 1: 1881 - Not relevant to Montague-Chelmsford Reforms. The period was before these reforms and unrelated.

- Option 2: 1902 - Preceded the reforms; the year is unrelated to these specific changes.

- Option 3: 1909 - Refers to the Morley-Minto Reforms, which expanded legislative councils but were different from Montague-Chelmsford.

- Option 4: 1919 - Correct year for Montague-Chelmsford Reforms.