The large connected urban area from boston to washington, dc, is often referred to as a(n)
a. metropolis
b. megalopolis
c. suburb
d. urban zone

The answer is the Urban Zone. The large connected urban area located from the Boston area until Washington D.C. is known as the urban zone. An urban areas are considered to be fully developed locations within a city, because urban areas have a lot of structures that are fit for human living, some of these structures are houses and commercial buildings.