Final answer:
The Cullinan and Kimberley placemarks are known for mining and diamond industry in South Africa.
Step-by-step explanation:
The Cullinan and Kimberley placemarks are known for B) Mining and diamond industry in South Africa.
Both Cullinan and Kimberley were important mining areas in South Africa, known for their diamond production. Cullinan is home to the Cullinan Diamond Mine, which is known for producing some of the world's largest diamonds, including the renowned Cullinan Diamond. Kimberley, on the other hand, was the site of the first recorded diamond discovery in South Africa, which led to the mining boom in the region.