The correct answer is:
c. It frees up disk space.
Regularly emptying the Recycle Bin is important for home PC users because the files that are deleted and sent to the Recycle Bin still occupy disk space until the Recycle Bin is emptied. This can help ensure that users have sufficient storage for their current needs. While other options may touch on aspects of system performance or security, the primary reason is indeed the freeing up of disk space.