Why did demand for plantation goods in Europe strengthen slavery?

Correct answer: Demand made slave-labour production profitable

The governing concept is the connection between European consumption, colonial plantation production and forced labour. Sugar, coffee and other plantation goods were sold in expanding European markets. Because consumers and merchants created strong demand, plantation owners expected substantial profits. To maintain large-scale production at low monetary cost, they continued to purchase and exploit enslaved Africans rather than employ fairly paid workers. Thus, demand strengthened the economic system that treated human beings as labour and property. Option A is correct because it explains the complete cause-and-effect chain. Options B, C and D are wrong: demand did not free slaves, close the National Assembly or build the Bastille; those statements confuse economic history with political events.