Increase volume C: size to use currently unallocated space

[OttoHänninen]

I find instructions to increase volume size using Disk management (W10) and I find the right-click options to Extend and Shrink the volume - but both these commands are grayed out and inactive. So I repeat the question: how do I extend volume C: into unallocated space on my drive (the problem may be that I have total of 5 volumes and C: is the third one; thus the free space is not next to this volume! What can I do?

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