To solve this question, the user needs to know about the history and design of the Linux operating system.

Linux was designed to "resemble somewhat" the Minix operating system.

Option A: Minix is the correct answer, as Linux was designed in part to be a free alternative to Minix, a Unix-like operating system developed by Andrew S. Tanenbaum.

Option B: Windows is incorrect because Linux was not designed to resemble Windows. Windows is a proprietary operating system created by Microsoft, whereas Linux is an open-source operating system.

Option C: System V is incorrect because Linux was not designed to resemble System V. System V is a commercial version of Unix developed by AT&T.

Option D: Vunix is incorrect because there is no such thing as Vunix. It is possible that this option meant to refer to Unix, which was certainly an inspiration for Linux, but it is not the answer to the question as worded.

Therefore, the answer is: A. Minix