The correct answer is: A) Kollam.
Muziris was an ancient port city on the Malabar Coast of India. It was located in the present-day district of Kollam in Kerala. The city was founded by the Chera dynasty in the 1st century CE and flourished as a major trading center until it was destroyed by the Portuguese in the 16th century.
Muziris was a major center of trade between India and the Roman Empire. The city was known for its spices, ivory, and other goods. It was also a major center of Buddhism and Hinduism.
The ruins of Muziris have been excavated at several sites in Kollam district. The most important site is Pattanam, which is located about 10 kilometers from Kollam city. Pattanam has been dated to the 1st century BCE and is believed to be the site of the ancient port of Muziris.
The ruins of Muziris are a valuable source of information about the history of trade and commerce in ancient India. They also provide insights into the culture and religion of the people who lived in the region at that time.
The other options are incorrect because they are not located on the Malabar Coast of India. Kollam is the only district in Kerala that is located on the Malabar Coast.