Which of the following has very dense population?

The northeastern seaboard of the USA has a very dense population. This region, also known as the Northeast Megalopolis, is a heavily urbanized area that includes cities such as New York, Boston, and Philadelphia. It is home to over 50 million people and is one of the most densely populated regions in the world. The Northeast Megalopolis has a long history of industrialization and urbanization, which has contributed to its high population density. Additionally, the region has a highly developed transportation infrastructure and is a center for commerce, finance, and culture, which attracts people from all over the world.