The correct answer is: Bharuch.
Lothal is an archaeological site of the Indus Valley Civilization located in the Bharuch district of Gujarat, India. It is one of the largest Harappan sites outside Pakistan. Lothal was excavated by the Archaeological Survey of India between 1955 and 1960. The site was occupied from about 2400 to 1900 BCE.
Lothal was a major port city and a center of trade and commerce. The city was well-planned and had a sophisticated drainage system. Lothal is also known for its terracotta figurines and its bead industry.
The other options are incorrect because they are not the districts that are home to the ancient port city of Lothal. Ahmedabad is the capital of Gujarat and is located in the Ahmedabad district. Bhavnagar is a city in the Bhavnagar district. Surat is a city in the Surat district.