The first thing there is, you have two "recovery" partitions. You PROBABLY only need one of them, but you can't be sure, because other things that aren't Windows recovery partitions can be marked as recovery partitions. Often what it really means is "Don't touch this". To be safe, leave them alone.
So what you'd do then, in order is (and if I were you I'd use a tool like Partition Magic to do it):
Drop the D: partition
Move the recovery partitions up to the end of the disk (try to keep them aligned on 1MB, or even 1GB, boundaries)
Now you can grow the C: partition into the space where they used to be and the unallocated space in between.
Storage management is one of those things that Windows makes much more obfuscated than it really needs to be.