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."
The Gulf of Tonkin joint resolution was passed by the US Congress so President Johnson can be authorized to take charge and use the military against Vietnam. The incident happened when the USS Maddox at Tonkin was attacked by Vietnamese using torpedos despite several warnings during a patrol round.
The Arabian Peninsula is bordered by the Red Sea to the west and southwest, the Persian Gulf to the northeast, and the Indian Ocean to the southeast. It became like this because of a rift that happened with the Red Sea many years ago.
They introduced the First Five Year plan