You administer a Windows 10 Enterprise computer that runs Hyper-V. The computer hosts a virtual machine
with multiple snapshots. The virtual machine uses one virtual CPU and 512 MB of RAM.
You discover that the virtual machine pauses automatically and displays the state as paused-critical.
You need to identify the component that is causing the error.
Which component should you identify?

A.
no virtual switch defined

B.
insufficient memory

C.
insufficient hard disk space

D.
insufficient number of virtual processors

Explanation:
In this question, the VM has “multiple snapshots” which would use up a lot of disk space. Virtual machines will
go into the “Paused-Critical” state in Hyper-V if the free space on the drive that contains the snapshots goesbelow 200MB.
One thing that often trips people up is if they have their virtual hard disks configured on one drive – but have left
their snapshot files stored on the system drive. Once a virtual machine snapshot has been taken – the base
virtual hard disk stops expanding and the snapshot file stores new data that is written to the disk – so it is
critical that there is enough space in the snapshot storage location.
Incorrect Answers:
A: No virtual switch being defined would not cause the Pause-Critical state.
B: Insufficient memory would not cause the Pause-Critical state.
D: An insufficient number of virtual processors would not cause the Pause-Critical state.

http://blogs.msdn.com/b/virtual_pc_guy/archive/2009/04/22/why-is-my-virtual-machine-paused-critical-hyperv.aspx