The most accurate response regarding the causes of the Dust Bowl is: "The Dust Bowl was caused by drought, overgrazing, and commercial agriculture."
The Dust Bowl, which occurred during the 1930s, was primarily driven by severe drought conditions that affected the Great Plains, combined with poor agricultural practices and overgrazing that stripped the land of its natural grasses, leading to soil erosion and dust storms. DDT and the near extinction of the buffalo are not directly associated with the events of the Dust Bowl.