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The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by

  1. page size
  2. physical size of memory
  3. the instruction set architecture
  4. number of processes in memory
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There are two important tasks in virtual memory management: a page-replacement strategy and a frame-allocation strategy. Frame allocation strategy says gives the idea of minimum number of frames which should be allocated. The absolute minimum number of frames that a process must be allocated is dependent on system architecture, and corresponds to the number of pages that could be touched by a single (machine) instruction.
So, it is instruction set architecture i.e. option (C) is correct answer.
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