The correct answer is option 2, upper middle class. During the 19th Century reawakening in India, it was primarily the upper middle class who played a significant role in driving social and intellectual reforms. This class consisted of professionals, intellectuals, and individuals from the urban areas who were educated in Western ideals and ideas. They were influenced by the ideas of the European Enlightenment and sought to bring about social and cultural changes in India.

It is important to note that while the upper middle class had a significant impact during this period, other segments of society also contributed to the reawakening to some extent. However, the upper middle class had greater access to education and resources, which allowed them to be at the forefront of the movement for change.