Option 1: Intra-state migration refers to the movement of people within the same state. It does not specifically mention the sequence of movement from village to town to city, so this option is not the correct answer.
Option 2: Step-wise migration is the correct answer. It describes the gradual movement of people from one place to another, in this case, from a village to a small town and then to a city. It suggests a progressive sequence of migration.
Option 3: Inter-state migration refers to the movement of people from one state to another. It does not accurately describe the scenario of people moving from a village to a small town and then to a city, so this option is not the correct answer.
Option 4: Forced migration involves people being compelled to leave their homes due to factors like conflict, persecution, or natural disasters. It does not relate to the scenario mentioned in the question, so this option is not the correct answer.
Therefore, the correct answer is option 2, step-wise migration.