Concept:The correct word must appropriately describe movement from one region to another based on seasons.Explanation:"Migrated" means to move from one region or habitat to another, especially according to the seasons."Travelled" refers to going from one place to another without the idea of seasonal movement."Immigrated" means to come into a new country to live permanently."Participant" is a noun meaning a person who takes part in something.Therefore, the word that best completes the sentence is "migrated".Answer:A. migrated