Final answer:
To understand how CPUs work, Carla should watch the video 'Introduction to Computer Processing,' which will likely cover the roles, functions, and importance of a CPU in a computer system.
Step-by-step explanation:
If Carla wants to learn more about how CPUs work, the most useful video to watch would be "Introduction to Computer Processing". This video is likely to cover the central processing unit (CPU), which is the primary component of a computer responsible for executing instructions and processing data. By learning about computer processing, Carla will gain insights into how the CPU interprets and executes program instructions, how it handles various computational tasks, and the importance of its role in the overall operation of a computer system.