How did the ghana empire gain, consolidate, and lose power

Around 1076 CE, the Ghana Empire started to collapse. During that time, the Almoravid of Northern Africa attacked the Ghana Empire due to trade issues by the Saharan commercial center. The king basically lost his trading monopoly.

Explanation:

The Ghana Empire, in particular, grew rich from the trans-Sahara trade. ... The people were allowed to trade in gold dust, but had to turn over any gold nuggets to the government. As such, the state became very powerful as well, adding to the complexity of Ghana's agrarian civilization.

The Ghana Empire crumbled from the 12th century CE following drought, civil wars, the opening up of trade routes elsewhere, and the rise of the Sosso Kingdom (c. 1180-1235 CE) and then the Mali Empire (1240-1645 CE).

what are the answers

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.