The palace city of Karnataka known for its opulent Mysore Palace:

Bengaluru
Mysuru
Hampi
Hubli-Dharwad

The correct answer is B) Mysuru.

Mysuru, formerly known as Mysore, is a city in the Indian state of Karnataka. It is the third-largest city in the state after Bangalore and Hubli-Dharwad. Mysuru is known for its palaces, temples, and gardens. The city is also home to the Mysore Palace, which is one of the largest palaces in India.

The Mysore Palace is a 19th-century palace complex that is located in the heart of Mysuru. The palace is built in the Indo-Saracenic style of architecture and is one of the most popular tourist attractions in Mysuru. The palace is open to the public and is a popular spot for weddings and other events.

The Mysore Palace is a UNESCO World Heritage Site and is one of the most important cultural landmarks in India. The palace is a symbol of the city’s history and culture.

The other options are incorrect because they are not cities in Karnataka. Bengaluru is the capital of Karnataka and is the largest city in the state. Hubli-Dharwad is a twin city in Karnataka that is the second-largest city in the state. Hampi is a UNESCO World Heritage Site that is located in the state of Karnataka.