Branding Logo Image - Final 4

This was my process for choosing the Final 4.
I began with 8 that I liked the best so far.

I chose to place the circle around each of the images to help me decide which ones would look best if they had a border. And, minified them to see which would translate better on a smaller scale for a charm or stamp.

These are the 4 that I felt were strong enough to consider in the final round of decision making.

I think I am leaning towards C & D. I will likely take the two I choose at this point, edit them, and try them with some of the fonts I have developed. I would appreciate some more opinions on these images.