The correct option is C Stop watch study
Frederick Taylor proposed the following four principles of scientific management
1. This theory develops a science for each element of a man's work, which replaces the old rule of-thumb method. It replaces guesswork methods with a scientific study of the tasks.
2. Select, train, and develop each worker rather than leaving them to train themselves.
3. Determining time standard for each job through stop watch study.
4. There is an almost equal division of the work and the responsibility between the management and the workmen. The management take over all work for which they are better fitted than the workmen, while in the past almost all of the work and the greater part of the responsibility were thrown upon the men