Final answer:
The main reasons people struggle with time management are b) procrastination and c) overcommitment.
Step-by-step explanation:
The main reason people struggle with time management is procrastination. Procrastination is the act of delaying or postponing tasks, leading to poor time management and a build-up of unfinished work. It often occurs due to a lack of motivation or focus.
Another significant reason is overcommitment. When people take on too many responsibilities or agree to do more than they can handle, they become overwhelmed and struggle with managing their time effectively.