A major commercial center in southern Mizoram is:

The correct answer is: d) Khawzawl.

Khawzawl is the headquarters of Lawngtlai district in Mizoram, India. It is located at an altitude of 1,200 meters (3,900 feet) above sea level. The town has a population of about 15,000 people. It is a major commercial center in southern Mizoram. The town is well connected by road to other parts of Mizoram and to the neighboring states of Assam and Manipur. The town has a number of government offices, schools, hospitals, and banks. There are also a number of hotels and restaurants in the town.

The other options are incorrect because:

• Thenzawl is the headquarters of Serchhip district in Mizoram.
• Hnahthial is a town in Serchhip district in Mizoram.
• Lawngtlai is a town in Lawngtlai district in Mizoram.