The correct answer is: b) Midland Region.
The Midland Region is the most extensive landform in Kerala. It is a plateau that covers about two-thirds of the state. The region is characterized by its rolling hills, valleys, and rivers. The Midland Region is also home to the state’s capital city, Thiruvananthapuram.
The Coastal Plain is a narrow strip of land that runs along the Arabian Sea coast. The region is characterized by its sandy beaches, backwaters, and lagoons. The Coastal Plain is also home to the state’s major ports, Kochi and Kozhikode.
The Highland Region is a mountainous region that covers about one-third of the state. The region is characterized by its high peaks, dense forests, and waterfalls. The Highland Region is also home to the state’s highest peak, Anamudi.
The River Valleys are a series of valleys that run through the state. The valleys are home to the state’s major rivers, including the Periyar, the Pamba, and the Bharathapuzha. The River Valleys are also home to the state’s major dams, including the Idukki Dam and the Mullaperiyar Dam.