In your opinion, how did the development of European sea trade networks (by the Portuguese, Spanish, Dutch, and British) and the development of the African slave trade impact each other? 

It impacted positively on them because one of the main reasons for the Europeans to come to Africa was to spread Christianity and check the spread of Islam,so when they came to spread the gospel we are now children of God and they have also become heirs of Heaven

i am sure the answer is d

it made them more prductive and efficent but with the change of polcies less and les got into the navy