Mahatma Gandhi and Rabindranath Tagore did not define India as a `nation` because they were critical of hegemonic culture. This means that they were against the dominance of one culture over others. They believed in the importance of cultural diversity and were opposed to the idea of a homogenous nation.

Option 1 suggests that they were appreciative of cultural divisiveness, which is not entirely accurate. While they did value cultural diversity, they were critical of the divisions and conflicts that arose from it.

Option 2 correctly states that they were opposed to the idea of homogeneity. They believed in the coexistence of diverse cultures rather than the assimilation of different cultures into one.

Option 3 suggests that they were supportive of `oneness`, which does not align with their views. They believed in unity amidst diversity, but not the suppression of cultural differences for the sake of a singular identity.

Overall, option 4 is the most accurate as it highlights their criticism of hegemonic culture, indicating their opposition to the dominance of one culture over others in defining India as a `nation`.