Which scenario best exemplifies counter migration?

The scenario that best exemplifies counter migration is one in which there is a movement of people in opposite directions between two regions. In the case presented, Italians migrating to France while French citizens move to Italy reflects this dynamic perfectly. Counter migration occurs when an influx of migrants to a certain country or region is offset by a corresponding number of individuals leaving that country or region to return to their place of origin or to another location. This bidirectional flow illustrates the complex relationships between countries and can be influenced by various economic, social, or political factors.

The other scenarios do not accurately represent counter migration in the same way. For instance, while Puerto Ricans migrating to the U.S. amid some U.S. citizens relocating to Puerto Rico indicates some reciprocation of migration, it primarily reflects a regional migration rather than a direct exchange or return. The same applies to the other scenarios, where one group moves to a new location without a corresponding or direct opposite movement from the receiving country to the sending one.