This paired question tests two independent historical relationships and requires both to be correct in the stated order. Here Montague Declaration 1917 fits the complete historical coordinates supplied by “The concept of 'responsible government' in India was first used in an official document by which document?”—the relevant actor, moment and outcome must all agree. This development forms part of the changing national movement, in which constitutional negotiation, mass mobilisation, boycott, civil disobedience and revolutionary action followed different strategies; Exact dates and organisational decisions matter because related sessions or phases often performed different functions, a distinction applied here to Montague Declaration 1917. A comparison with Government of India Act 1919, Morley-Minto Reforms 1909 and For statement two, the supported answer is Jawaharlal Nehru. At this session the Congress formally adopted the goal of Purna Swaraj (complete independence). The tricolor was unfurled on the banks of the Ravi river at midnight on 31 December 1929. Here Jawaharlal Nehru fits the complete historical coordinates supplied by “Who was the President of INC at the time of Lahore session (1929) that declared Purna Swaraj?”—the relevant actor, moment and outcome must all agree. This development forms part of the changing national movement, in which constitutional negotiation, mass mobilisation, boycott, civil disobedience and revolutionary action followed different strategies; Exact dates and organisational decisions Therefore the correct ordered pair is Montague Declaration 1917 followed by Jawaharlal Nehru. An option containing only one correct component must be rejected because the stem asks for a complete two-part match.