Elmina Castle is a fortified trading post built by the Portuguese in the late 15th century along the Gold Coast of Africa. What was exported from its docks?

Gold and slaves.

Explanation:

Elmina Castle was built by the Portuguese in 1482 in Elmina, Ghana. It is the first trading post in the Gulf of Guinea, and the oldest European building in Sub-Saharan Africa. The castle was built as a trading zone to tap from the already thriving gold trade between the native people, and other foreigners. After its establishment as a trading zone, slaves was added to the commodities traded from the castle.

the correct answer is to reduce tax