The correct answer is b) Coastal regions.
Kerala is a state in India with a population of over 33 million people. The state is located on the Malabar Coast of the Indian subcontinent, and has a coastline of over 600 kilometers. The population density of Kerala is 860 people per square kilometer, which is the highest in India.
The coastal regions of Kerala are the most densely populated areas of the state. This is due to a number of factors, including the availability of fertile land, the proximity to the sea, and the mild climate. The coastal regions are also home to a number of important cities, including Thiruvananthapuram, Kochi, and Kozhikode.
The hilly areas of Kerala are less densely populated than the coastal regions. This is due to a number of factors, including the rugged terrain, the lack of fertile land, and the high altitude. The hilly areas are also home to a number of tribal communities.
The midlands of Kerala are located between the coastal regions and the hilly areas. The population density of the midlands is intermediate between the coastal regions and the hilly areas. The midlands are home to a number of important cities, including Thrissur and Palakkad.
The forest areas of Kerala are the least densely populated areas of the state. This is due to a number of factors, including the dense vegetation, the lack of roads, and the presence of wild animals. The forest areas are home to a number of important wildlife sanctuaries, including Periyar Tiger Reserve and Eravikulam National Park.