The correct answer is: C. Chkdsk
Chkdsk is a Windows system tool that can be used to check the integrity of a disk and fix any errors that are found. It can also be used to defragment a disk, which can improve performance.
Fdisk is a Windows system tool that can be used to partition a disk. It can also be used to create and delete partitions, and to format disks.
Scandisk is a Windows system tool that can be used to check the integrity of a disk and fix any errors that are found. It is similar to Chkdsk, but it is not as widely used.
Fixdsk is a Windows system tool that can be used to fix errors on a disk that cannot be fixed by Chkdsk. It is a more powerful tool, but it is also more dangerous, and should only be used if Chkdsk is unable to fix the errors.
In conclusion, Chkdsk is the best tool for fixing errors on disks. It is a safe and reliable tool that can be used to check the integrity of a disk and fix any errors that are found.