The correct options are
A The discovery of Harappan Civilisation became a milestone of Indian history.
D Colonel James Todd wrote about the history of Rajasthan, where he condemned the Indian culture.
The Harappan Civilisation was an important discovery as it revealed a rich history of India dating as far back as the 3rd Millennium B.C.E. The colonial policies of the British influenced British historians who wrote about the history of India. Their writings lacked an objective perspective, and they often condemned Indian culture in their work. Many Indian historians took up the task of exposing the limitations in the writings/works of British historians.