Answer:
Migrating from Mexico
Step-by-step explanation:
Emigrating occurs when someone moves to another country.
Immigrating occurs when someone enters a country with the intent of living there.
Migrating occurs when an animal relocates their habitat based on the changing of seasons.
Based on these definitions, because monarchs are animals, it makes sense to say that the monarchs are migrating. If they are entering the United States, the best answer would describe how the monarchs are migrating from Mexico. You could also say that the monarchs are migrating to the United States.