Based on the provided statements, the best summary of modern human migration patterns seems to be that "Areas of Central and South America are experiencing the highest rates of population change." This suggests significant movement of people either into or out of these regions, impacting their demographics.
The other statements either focus specifically on migration rates of individual countries or regions, which may not fully capture the broader trend of modern human migration. For instance, the statement regarding Bolivia highlights a specific negative migration rate but does not provide a comprehensive view of migration patterns across the entire continent or globally.
Therefore, the second statement reflects a more general observation about migration dynamics in a broad region, making it the most encompassing summary of modern human migration.