Correct Answer: Option B (Wayanad)
Wayanad is the only district in Kerala that shares its borders with both Karnataka and Tamil Nadu. This makes it unique among Kerala districts in terms of inter-state boundaries.
Geographical explanation:
Wayanad district is located in the northeastern part of Kerala.
It shares its northern and eastern borders with Karnataka state.
It shares its southeastern border with Tamil Nadu.
Specifically, Wayanad borders Karnataka's Kodagu, Mysore, and Chamarajanagar districts, and Tamil Nadu's Nilgiris district.
Other districts that share borders with neighboring states:
Palakkad borders only Tamil Nadu
Idukki borders only Tamil Nadu
Kasaragod borders only Karnataka
