The Dalton Plan was developed by:AHelen ParkhurstBJohn DeweyCMaria MontessoriDKilpatrickAnswer: A. Helen Parkhurst Read Explanation: • Helen Parkhurst. She created this progressive education model around 1919 in Dalton, Massachusetts, emphasizing student autonomy, individualized pacing, assignments, and laboratory-style learning over rigid class schedules.Read more in App