MS-DOS is an operating system for x86-based personal computers mostly developed by Microsoft. It doesn’t provide multi-user facility.
XENIX is a discontinued version of the Unix operating system for various microcomputer platforms, licensed by Microsoft from AT&T Corporation. It doesn’t provide multi-user facility.
OS/2 is a series of computer operating systems, initially created by Microsoft and IBM. It doesn’t provide multi-user facility.
So, Option (D) is correct.