The correct answer is c) Idukki.
Idukki is a district in Kerala, India. It is the largest district in Kerala in terms of area. The district is known for its tea plantations, coffee plantations, and spices. It is also home to the Idukki Dam, the largest dam in Kerala.
Wayanad is a district in Kerala, India. It is the second largest district in Kerala in terms of area. The district is known for its natural beauty, including its forests, hills, and valleys. It is also home to the Wayanad Wildlife Sanctuary, the largest wildlife sanctuary in Kerala.
Kannur is a district in Kerala, India. It is the northernmost district in Kerala. The district is known for its beaches, backwaters, and temples. It is also home to the Kannur International Airport, the second international airport in Kerala.
Palakkad is a district in Kerala, India. It is the second most populous district in Kerala. The district is known for its spices, including cardamom, pepper, and cloves. It is also home to the Palakkad Fort, a 16th-century fort built by the Portuguese.