Neel Darpan is a play that is based on the story of the Indigo Rebellion of Bengal during the years 1860-61. The author of this play is Dinabandhu Mitra.

It is important to note that the other options provided are not correct. Bankim Chandra Chattopadhyay is a renowned writer and novelist but he is not the author of Neel Darpan. Sisir Kumar Ghosh and Motilal Ghosh are also not the authors of this play. Similarly, Madhusudan Dutta, another famous Bengali poet and playwright, is also not the author of Neel Darpan.

To properly understand the context and significance of the play, it is essential to know about the Indigo Rebellion. This rebellion was a significant event in the history of Bengal, where the indigo farmers rose against the oppressive practices of the British indigo planters. Neel Darpan shed light on the exploitative conditions faced by the indigo farmers and played a crucial role in raising awareness about their plight.

In conclusion, Dinabandhu Mitra authored the play Neel Darpan, which depicts the story of the Indigo Rebellion of Bengal.