The correct answer is d) Western Ghats.
The Palakkad Gap is a low-lying pass in the Western Ghats mountain range in India. It is located in the state of Kerala, and connects the Malabar and the Deccan Plateaus. The Palakkad Gap is a significant feature in the Western Ghats because it is a major transportation corridor. The National Highway 47, which connects Chennai and Thiruvananthapuram, passes through the Palakkad Gap. The Palakkad Gap is also an important agricultural region. The area is known for its rice cultivation, and is also home to a number of tea and coffee plantations.
The Anamalai Hills are a mountain range in the Western Ghats, located in the states of Tamil Nadu and Kerala. The Nilgiri Hills are a mountain range in the Western Ghats, located in the states of Tamil Nadu, Karnataka, and Kerala. The Cardamom Hills are a mountain range in the Western Ghats, located in the state of Kerala.