Over the course of the 1600s, which development likely changed the friendly relations between the interior residents of Sierra Leone and the Europeans described in the
passage

D. An increase in the trade of enslaved people

Explanation:

The passage is not attached however this should be the right answer. Sierra Leone was one of the worst affected areas by slavery as first the Portuguese and then the British transported Africans in the Sierra Leone area to North America for work in plantations.

Indeed the first slaves to arrive in North America were from Sierra Leone and as the Africans there were skilled in growing rice, they were considered valuable and so there was an increase in the number being sold.

This likely changed the friendly relations between the residents and the Europeans.

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