The correct answer is c) High Ranges.
The High Ranges are the mountainous regions of Kerala, located in the Western Ghats. The climate in the High Ranges is cooler than in the other regions of Kerala, due to its higher altitude. The average temperature in the High Ranges ranges from 15°C to 25°C, with the lowest temperatures recorded in the winter months.
The Coastal Plains are the lowlands of Kerala, located along the Arabian Sea coast. The climate in the Coastal Plains is warmer than in the other regions of Kerala, due to its proximity to the sea. The average temperature in the Coastal Plains ranges from 25°C to 35°C, with the highest temperatures recorded in the summer months.
The Midland Region is the central region of Kerala, located between the Coastal Plains and the High Ranges. The climate in the Midland Region is temperate, with average temperatures ranging from 20°C to 30°C.
The River Valleys are the low-lying areas of Kerala, located along the rivers. The climate in the River Valleys is humid, with average temperatures ranging from 25°C to 35°C.