The correct answer is B. Cochin.
The Dutch Palace in Mattancherry is a palace located in Mattancherry, a suburb of Kochi in the Indian state of Kerala. It was built in the 16th century by the Portuguese and later handed over to the Dutch in 1663. The palace is a fine example of Indo-Dutch architecture and is one of the most popular tourist attractions in Kochi.
The palace is a rectangular building with a courtyard in the center. The walls of the palace are decorated with murals depicting scenes from Hindu mythology. The palace also has a number of rooms, including the Durbar Hall, the Audience Hall, and the Banqueting Hall.
The Dutch Palace is a UNESCO World Heritage Site and is a must-visit for anyone interested in the history of Kerala.
Option A is incorrect because Travancore was a former kingdom located in the southern part of Kerala. The capital of Travancore was Thiruvananthapuram.
Option C is incorrect because Kolathunadu was a former kingdom located in the central part of Kerala. The capital of Kolathunadu was Thrissur.
Option D is incorrect because Venad was a former kingdom located in the northern part of Kerala. The capital of Venad was Kollam.