Which best describes how the east African slave trade changed after 1500?

After 1500, the East African slave trade underwent significant changes, largely due to the rise of European colonial powers and the demand for labor in the Americas. The trade expanded as European traders increasingly sought slaves to work on plantations, leading to a more organized and large-scale export of enslaved people from the region. Additionally, the involvement of Omani Arabs and other local traders intensified, facilitating the capture and sale of slaves. This shift marked a transition from primarily regional slavery to a broader, transcontinental system that linked East Africa to global markets.