The Western Ghats are a mountain range that runs along the western coast of India. They are the main mountain range in the state of Kerala. The Western Ghats are a UNESCO World Heritage Site and are home to a variety of plant and animal life.
The Himalayas are the highest mountain range in the world. They are located in northern India and Nepal. The Himalayas are a major source of water for the Indian subcontinent.
The Vindhya Range is a mountain range that runs through central India. It is the dividing line between the northern and southern parts of India. The Vindhya Range is not as high as the Himalayas, but it is still a significant mountain range.
The Aravalli Range is a mountain range that runs through northwestern India. It is the oldest mountain range in India. The Aravalli Range is not as high as the Himalayas or the Vindhya Range, but it is still a significant mountain range.
Therefore, the correct answer to the question “Which mountain range borders Kerala to the east?” is (d) Western Ghats.