Which of the following windows version support 64 bit processor?

Answer: Option C

Microsoft Windows XP Professional x64 Edition, released on 25^th April 2005, is an edition of Windows XP for x86-64 personal computers. It is designed to use the expanded 64 bit memory address space provided by the x86-64 architecture.
The primary benefit of moving to 64 bit is the increase in the maximum allocatable random-access memory (RAM).