Final answer:
The bedsM system's success in reducing procrastination is dependent on an individual's commitment to change, and the system is less likely to work for those resistant to change.
Step-by-step explanation:
Dr. Sung's observation about the effectiveness of the bedsM system in reducing procrastination on the commitment of the individual to change their thinking and behaviors. The success of such a system depends greatly on one's willingness to adapt and the belief in the possibility of change. Individuals who have a strong internal locus of control, which is the belief that they have control over their own outcomes, are healthier, cope better, and tend to be less depressed. Therefore, the only category of people who have not seen procrastination disappear with the bedsM system, according to the choices provided, would most likely be C) Those resistant to change, as they may not buy into the potential efficacy of the system or may not want to alter their established habits.