The correct answer is: d) Hnahthial.
Hnahthial is the smallest district in Mizoram by area. It has a total area of 1,003 square kilometers. The district is located in the southern part of the state and is bordered by the districts of Serchhip, Lawngtlai, and Saitual. The headquarters of the district is the town of Hnahthial.
The district is home to a number of ethnic groups, including the Hmar, Paite, and Chakma. The main language spoken in the district is Hmar. The district is also home to a number of different religions, including Christianity, Hinduism, and Islam.
The economy of the district is based on agriculture, with rice being the main crop. The district is also home to a number of small industries, including handloom weaving and carpentry.
The district is a popular tourist destination, with a number of attractions, including the Hnahthial Lake, the Hnahthial Wildlife Sanctuary, and the Hnahthial Hills.
The other options are incorrect because:
- Aizawl is the capital of Mizoram and the largest district in the state. It has a total area of 2,928 square kilometers.
- Serchhip is the second largest district in Mizoram. It has a total area of 2,818 square kilometers.
- Lawngtlai is the third largest district in Mizoram. It has a total area of 2,758 square kilometers.