While working with MS-DOS, which command is used to copying the files to transfer from one PC to another one?

Answer: Option D

In Disk Operating System (DOS), the command used to copy files to transfer them from one PC to another is Option D: Copy. The Copy command allows you to copy files from one location to another, whether within the same system or to another system.

Option A, "Rename," is used for renaming files and is not relevant to copying files.
Option B, "Path," is used to set or display the search path for executable files and is not used for copying files.
Option C, "Dir," is used to display a list of files and directories but does not copy files.

Therefore, the correct answer is Option D: Copy.