Concept:An active volcano is one that has erupted at least once in the past 10,000 years.Explanation:Cotopaxi is a famous active volcano.It is located in the Andes mountain range in South America.The Andes run along the western side of the continent, passing through Ecuador where Cotopaxi lies.Its most recent eruption was from August 2015 to January 2016.Answer:C. Andes