The portion of the process scheduler in an operating system that dispatches processes is concerned with

The correct answer is D. Assigning ready processes to CPU.

Explanation: The dispatcher in the process scheduler is responsible for selecting which process in the ready queue should be allocated CPU time for execution. When processes are ready to run, they are moved from the ready queue to the CPU where they can be executed. This is a crucial part of managing and scheduling processes in an operating system. If you need further details, feel free to ask!