The correct answer is A) Idukki.
Idukki is the largest district in Kerala in terms of area, covering an area of 7,452 square kilometers. It is located in the central part of the state and is bordered by the districts of Ernakulam, Thrissur, Palakkad, Malappuram, and Wayanad. The district is known for its natural beauty, with its mountains, forests, and rivers. It is also home to the Idukki Dam, the largest dam in Kerala.
Palakkad is the second largest district in Kerala, covering an area of 5,670 square kilometers. It is located in the northern part of the state and is bordered by the districts of Thrissur, Malappuram, Kozhikode, Wayanad, and Coimbatore (Tamil Nadu). The district is known for its fertile land and is a major producer of rice, sugarcane, and coconut.
Wayanad is the third largest district in Kerala, covering an area of 2,194 square kilometers. It is located in the northern part of the state and is bordered by the districts of Kozhikode, Malappuram, and Kannur. The district is known for its natural beauty, with its mountains, forests, and wildlife sanctuaries. It is also home to the Eravikulam National Park, the largest national park in Kerala.
Thiruvananthapuram is the fourth largest district in Kerala, covering an area of 1,560 square kilometers. It is located in the southern part of the state and is bordered by the districts of Kollam, Pathanamthitta, Alappuzha, and Ernakulam. The district is the capital of Kerala and is home to the state government offices. It is also a major tourist destination, with its beaches, temples, and palaces.