Correct Answer: Option C - Kottayam
Kottayam is the only district in Kerala that is completely landlocked by other Kerala districts without any international borders or coastline. Let's examine why:
Kottayam is surrounded by:
Idukki district to the east
Pathanamthitta and Alappuzha districts to the south
Alappuzha and Ernakulam districts to the west
Ernakulam and Idukki districts to the north
The other options are incorrect because:
Wayanad (Option A): Shares an international border with Karnataka to the north and Tamil Nadu to the east.
Palakkad (Option B): Shares a border with Tamil Nadu to the east through the Palakkad Gap, which is known as the "Gateway of Kerala."
Alappuzha (Option D): Has a coastline along the Arabian Sea to the west.