Wait! Sorry, it is now too late for AniamL, Faldage, owlbow, and Musick, but for the rest of you I ask....
PLEASE DON'T WASTE YOUR VOTE. I KNOW WHAT A FIKE IS!

It is (b) a river fish trap. and I submitted it.

Four years ago a lady in Leeds, Alabama reported to the Bham News that she had found an old indian fike in a creek on her property. The News published a photo of the fike and asked for help in confirming the carved rock as a indian fike.
I went to the site and saw that the so called "fike" was actually a peculiar series of eroded joints in the jutting Chickamauga Limestone and reported this back to the paper.

Before then I didn't even know what a "fike" was, but now I do and it is (b).