In its last century, ending in 1807 the leading carriers of slaves in the transatlantic trade was?

Explanation:

Britain was the most dominant between 1640 and 1807 when the British slave trade was abolished. It is estimated that Britain transported 3.1 million Africans (of whom 2.7 million arrived) to the British colonies in the Caribbean, North and South America and to other countries.

arresting and exicuting citizens

i am sure the answer is d