Final answer:
The statement is true, as the operating system manages the computer's hardware and software resources, providing a stable environment for applications and user activities.
Step-by-step explanation:
The statement that the operating system is used to manage the computer's activities is TRUE. The operating system serves as an intermediary between the user and the computer hardware. It handles a multitude of tasks such as managing files, controlling peripheral devices, enabling user interface, and administering system resources like memory and processor time.
For example, when you open a program, the operating system allocates memory for it to run, manages the input from your keyboard and mouse, and outputs information to the screen. Furthermore, it manages background tasks and ensures that different processes do not interfere with each other, providing a stable environment for applications to run.