What did Jawaharlal Nehru emphasize in his book "The Discovery of India"?

The tremendous impress of oneness that held India together in the past

The correct answer is Option 2  - The tremendous impress of oneness that held India together in the past

In "The Discovery of India," Jawaharlal Nehru emphasized the tremendous impress of oneness that held India together in the past, despite outward diversity and variety.

People who see themselves as a nation also embody a sense of continuing historical identity. That is, nations perceive themselves as stretching back into the past as well as reaching into the future. They articulate for themselves a sense of their own history by drawing on collective memories, legends, historical records, to outline the continuing identity of the nation. Thus nationalists in India invoked its ancient civilisation and cultural heritage and other achievements to claim that India has had a long and continuing history as a civilisation and that this civilisational continuity and unity is the basis of the Indian nation. Jawaharlal Nehru, for instance, wrote in his book The Discovery of India, “Though outwardly there was diversity and infinite variety among the people, everywhere there was that tremendous impress of oneness, which held all of us together in ages past, whatever political fate or misfortune had befallen us”.