Why were most european trading posts set up on the west african coast?

a. europeans preferred nautical trade to trading across land routes.
b. europeans were ill-equipped to travel into the interior of africa.
c. africans had already set up coastal trading posts.
d. in fact, most european trading posts were actually in the saharan desert.

Its ACTUALLY Europeans preferred nautical trade to trading across land routes(since they werent used to African terrain)

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

1. darius the great     persia  

2. piankhi       nubia

3. ezana       aksum

4.     nebuchadnezzar     babylonia

5. shalmaneser iii     assyria