Concept: The main idea of the poem centres on a spiritual pilgrimage and the search for redemption.Explanation:The poem "The Journey of the Magi" recounts the difficult physical journey of the Magi to see the infant Jesus. However, the poem's deeper concern is the spiritual transformation and the painful birth of a new faith. The journey symbolises the transition from the old dispensation to the new, representing a quest for salvation and rebirth rather than mere travel or escape.Thus, the theme is best summarised as the search for spiritual redemption.Answer: C. quest for salvation