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.
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