I'd say A. Christianity, Slavery, and the exploitation of natural resources.
We know that today KKK still is not completely gone from the US, it is just not as extreme. In the image, a figure dressed in KKK attire is casting a shadow over the US, implying that the KKK is spreading through that shadow. B says that KKK was dismembered and C says that they stopped discriminating, which based on the modern KKK this untrue, so it seems that the answer is A.
Hope this helped!
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