Question

what were two factors that caused the bantu migrations?
the discovery of gold and the introduction of foreign diseases
desertification and depletion of the soil
invasions by the roman and the muslim empires
war and famine

Explanation:

The Bantu migrations were largely driven by environmental and resource - related factors. Desertification (land turning into desert) and soil depletion made the land less suitable for farming, which was a key livelihood for the Bantu. The other options: the discovery of gold and foreign diseases are not major factors for Bantu migrations; invasions by Roman and Muslim empires didn't impact the Bantu region in a way to cause their migrations; war and famine were more consequences or less central compared to environmental degradation. So the correct factor among the given options related to Bantu migrations' cause is desertification and depletion of the soil.

Answer:

desertification and depletion of the soil