What effect did British rule have on slave trade during the age of new imperialism?
a.) the slave trade was increased so British could export more cotton
b.) slave trade was banned in Britain and all of its colonies
c.) slave trade in Britain decreased as more Africans moved there voluntarily
d.) The slave trade was not effected by British rule until After WWI

I think the answer is A but I wanted to double check, what do you guys think?