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#1
Doesn't appear a safe way to remove any partition/s. Some are quite small and wouldn't gain sufficient space to make the effort worthwhile. If wanting to make the C: partition larger one usually could use the Expand in Disk Manager but the thing blocking adding the D: partition to C: is the small partition between them, probably can't get rid of it.
But that 558Mb is not the windows build update?
If so, you can remove it.
thank you