Answer:
B.Interrupts
Explanation:
In a multiprogrammed system, the CPU is always able to share its time between the various programs and the different peripheral devices that need your attention, requiring a mechanism that allows the CPU to change between one software and another without problems.
The interruption mechanism was the basis for the implementation of the schematic parallelism between CPU and different software. For this reason, we can say that if a user reports that the computer monitor does not allow him to switch between Microsoft Word and Internet Explorer. This points to a possible problem with the interrupt mechanism.
