Which of the following terms refers specifically to the migration of people into a country?

The term that specifically refers to the migration of people into a country is immigration. This process entails individuals moving from one country or region to another with the intention of establishing residency or settling there. Immigration can be influenced by various factors, including economic opportunities, political stability, familial connections, or social conditions in the destination country.

The other options describe different migration concepts. Emigration refers to the act of leaving one's country to settle in another, which is the opposite of immigration. Transmigration typically involves the relocation of people within a region or between multiple regions rather than a clear movement into a country. An excursion suggests a short journey or trip, often recreational, and does not imply any permanent movement into a country. Understanding these distinctions is crucial in grasping the dynamics of migration and the terminology associated with it.