They extended usable hours of the day
Answer: They had the trading root of Timbuktu and along with the Mansa Musa ruling, people all over came and were trading. The consequences could've been people invading, thieves, etc.
This is a primary source, since it is a direct excerpt from what was said by James I.
hope this helps :)
Geographically, the fact that it was so concentrated in largely populated areas. Spreading may have occurred as people traveled. Basically because of huge population in the concentrated areas of the plague. Hope that helps a bit.
It is C. the dindus made it gold treasure