Interprocess communication (IPC) is a mechanism that allows processes to communicate and synchronize their actions. It enables different processes running on the same or different systems to exchange data and coordinate their activities. IPC is essential in modern operating systems to facilitate collaboration and resource sharing among processes.

IPC provides a standardized way for processes to interact with each other, regardless of their location or architecture. It allows processes to send and receive messages, share data, and coordinate their actions to achieve a common goal. Here, we will explore the reasons why option 'B' is the correct answer.

Allows processes to communicate:
IPC provides a means for processes to communicate with each other. Processes can exchange information, such as messages or data, through various communication channels. These channels can be shared memory regions, pipes, sockets, or message queues. By sending and receiving messages, processes can convey information, request services, or notify each other about significant events.

Allows processes to synchronize their actions:
IPC also enables processes to synchronize their actions. Synchronization ensures that processes coordinate their activities and avoid conflicts or inconsistencies. Processes can use synchronization mechanisms, such as semaphores, locks, or condition variables, to control access to shared resources or coordinate their execution. By synchronizing their actions, processes can cooperate effectively and avoid race conditions or other concurrency issues.

Benefits of IPC:
- Collaboration: IPC allows processes to work together and exchange information, enabling collaboration and coordination among different components of a system.
- Resource sharing: Processes can share resources, such as memory, files, or devices, through IPC mechanisms. This enables efficient utilization of resources and avoids duplication.
- Modularity: IPC facilitates the development of modular systems, where different processes can be developed independently and communicate through well-defined interfaces.
- Fault isolation: IPC can help isolate faulty processes from the rest of the system. By using separate processes for different components, failures in one process do not affect the overall system.

In conclusion, IPC is a crucial mechanism that allows processes to communicate and synchronize their actions. By enabling collaboration and resource sharing, IPC plays a vital role in the efficient and coordinated operation of modern computer systems.