When dealing with terms that seem to have obvious antonyms, it's crucial to consider the context and any provided instructions that might suggest unconventional interpretations.
Step 1: "Exodus" refers to a mass departure or migration, typically of people. Step 2: "Arrival" refers to the coming or reaching of a place, which contrasts with "exodus," meaning mass departure. Step 3: "Influx" refers to an arrival, but in a more specific sense of a large number of people or things entering. "Return" and "restoration" do not convey the opposite of departure.
Thus, the correct answer is "arrival."