Final answer:
Aging is a solution to the problem of indefinite blockage of low-priority processes in operating system schedulers, as it increases a process's priority over time to prevent starvation.
Step-by-step explanation:
A solution to the problem of indefinite blockage of low-priority processes is d) Aging. This is a technique used in computer operating systems' schedulers. Aging is a process that gradually increases the priority of processes that wait in the system for a long time. This means that if a low-priority process is waiting to be executed, it will eventually have its priority boosted enough that it is less likely to suffer from indefinite blockage, which is also known as starvation. Therefore, through aging, all processes get a chance to be executed, regardless of their initial priorities.