According to the Bureau of the Census, suburban areas:

Suburban areas have indeed shown an increase in population since 1970, which reflects broader trends in urbanization and residential migration patterns. Many people have moved to suburban regions seeking more space, better housing options, and perceived quality of life improvements compared to densely populated urban centers. This growth in suburbs is often attributed to factors such as the expansion of transportation infrastructure, availability of land for development, and the appeal of suburban schools and community amenities.

In addition to demographic shifts, economic factors and changes in lifestyle preferences also contribute to the ongoing growth of suburban areas. Throughout the decades, suburban regions have become increasingly popular, leading to significant developments in residential, retail, and service industries to accommodate the growing population. This trend aligns with broader patterns observed in the United States, making option A the most accurate statement regarding suburban population changes since 1970.