Explanation:

3rd option is correct.
Lord Chelmsford was the Viceroy of India when the Rowlatt Act was passed.
Lord Chelmsford served as Governor General and Viceroy of India from 1916 to 1921. Important events during his tenure included Lucknow Pact (1916), Khilafat Movement, Emergence of Gandhi as national leader, passing of Rowlatt Act and Jallianwalla Bagh Tragedy (1919), Non-Cooperation Movement, Third Afghan War and Treaty of Rawalpindi, August Declaration (1917), Montague-Chelmsford Reforms (1919).