Concept:The mineral deposit that attracted a large number of white settlers to South Africa is gold.
Explanation:The famous Witwatersrand reef in South Africa holds one of the world's richest gold deposits.
Its discovery in 1886 triggered a huge gold rush and drew many white settlers and miners into the region.
This boom led to the rapid growth of Johannesburg as the main centre of the South African gold-mining industry.
South Africa became one of the world's leading producers of gold because of this deposit.
Looking at the options, the correct mineral and location are gold in Witwatersrand.
Durban is known more for its port, while Cape Town is not a major copper-mining centre.
Johannesburg is the city that grew from the Witwatersrand goldfields, not an aluminium deposit.
Answer:C. Gold in Witwatersrand