Explanation:

- Option 1: 1921

- This is not the year when the Rowlatt Act was passed.

- 1921 is more closely associated with the Non-Cooperation Movement starting in India.

- Option 2: 1917

- 1917 is significant for the Champaran Satyagraha and not for the Rowlatt Act.

- The Rowlatt Act was not enacted in this year.

- Option 3: 1919

- This is the correct answer.

- The Rowlatt Act was passed by the British government in 1919.

- It allowed the British to arrest and detain people without trial.

- The act stirred huge protests across India.

- Option 4: None

- This is incorrect because the correct year is listed among the options.