The slave trade became a highly regulated business, as each slaving nation sought to license and control its own part. The trade received formal state backing from monarchs and from legislatures, ... In addition, the trade was made possible by the development of modern financial systems. Global trade on such a vast geographic scale involved enormous time lags. Slave ships were away from their home ports for 12 - 18 months at a time, and sugar and tobacco were sold in Europe months after being harvested by slaves. As a result, ship owners and planters were always in need of credit.
Which sentence best summarizes the main idea of the source above?
A. The transatlantic slave trade was strictly controlled and regulated by ship captains.
B. The transatlantic slave trade was regulated and supported by governments.
C. The transatlantic slave trade received no financial backing by modern financial systems.
D. The transatlantic slave trade took place only in European markets.

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