Concept:A volcano that has erupted in the past and still shows signs that it may erupt again is called a dormant volcano.Explanation:Dormant volcanoes are not currently erupting, but they have the potential to erupt in the future.An extinct volcano is one that is unlikely to erupt again.An active volcano is currently erupting or shows frequent activity.Since the volcano has erupted before and can possibly erupt again, it is described as dormant.Answer:C. dormant