What becomes clear by studying slave purchase labour production and European market profit together?

Correct answer: Slave trade was a complete economic cycle

Studying slave purchase, plantation labour, production, and European market profit together reveals a connected economic system rather than separate events. Traders purchased and transported enslaved people; plantation owners used their forced labour to grow and process goods; merchants then carried those goods to European markets, where they were sold for profit. Each stage supported the next stage and helped sustain the wider Atlantic economy.

Thus option A is correct: slave trade formed a complete economic cycle linking human trafficking, plantation production, overseas trade, and market profit. It was not merely a religious journey and was closely related to markets. The enslaved people did not benefit from this system; they were the people exploited within it. The supplied answer is consistent, and the key educational point is to identify the sequence from purchase to labour, production, sale, and profit.