OK.
You should be able to add that 1.7 gig on the far right to C with the mouse. Highlight C, right click it, and choose "extend volume".
The other 2 partitions are more problematic because even if you deleted them, the space could not then be added to C via Disk Management because they are to the left of C. If they were to the right of C, like the 1.7 gig, you could add them.
So you have 2 issues remaining:
Do you want to delete the two partitions to the left?
Assuming yes, you may have to use (free) 3rd party software to do that.
You almost certainly will have to use 3rd party software to add the new space to C.
I am not the local expert on these third party programs, but others here are quite familiar with them. I would guess they will reply within the next day or two--maybe in the next few hours. If not, bump your post back to the top in a day or two.
In the meantime, confirm that you can add that 1.7 unallocated on the right back to C.
The little partition on the left is curious because it is empty.