One reason is his attempted assassination on march 30,1981
Usually demand refers to someone tell someone else what to do, or how to do it. For example "Give me the remote." could be demanding.
The correct answer to this open question is the following.
Although no options are attached, we could say that the best primary source material about the works of Mohandas Gandhi should be their own writings. That is the characteristic of a primary source, the information was written by the character itself of people that directly witnessed the life or events. For instance, there is a book authored by Ronald Duncan, that collects a series of documents written by Gandhi. The name of the book is "Selected Writings of Mahatma Gandhi."
Matthew writing this cuz has to be 20 letter long