Which of the following best explains the pattern of outbreaks of bubonic plague shown on the map? Years passed between outbreaks because of regional mutations in the plague bacteria.
Continued contacts between peoples resulted in mostly simultaneous outbreaks in Asia, Africa, and Europe.
Arabic medical advances kept Muslim regions safe from the plague, while Europe and Asia were hard-hit.
Peoples located far inland had immunity to the plague bacteria, limiting plague outbreaks to coastal areas.