Areas with the lowest population density tend to be found in a) urban areas. b) rural areas. c) coastal areas. d) suburban areas.

B. Rural areas

Explanation:

A rural area is every area that is not urbanized. That means that it is outside of any city or town and it is mostly agricultural with small settlements. Mountains or forests are also considered rural and these places don't have nearly as many people living there as there are in towns. Coastal areas can be very populated and around 40% of the world's population lives within 100 miles of the coast.