The Brihadeeswarar Temple in Thanjavur is a magnificent example of:

Chola architecture
Pallava architecture
Pandyan architecture
Vijayanagara architecture

The correct answer is: a) Chola architecture.

The Brihadeeswarar Temple is a Hindu temple dedicated to Shiva, located in the town of Thanjavur in the Indian state of Tamil Nadu. It was built by the Chola king Rajaraja I in the 11th century CE. The temple is one of the largest and most impressive temples in India, and is a UNESCO World Heritage Site.

The temple is built in the Dravidian style of architecture, which is characterized by its large size, intricate carvings, and towering gopurams (gateway towers). The Brihadeeswarar Temple is particularly famous for its vimana (sanctum sanctorum), which is the largest in India. The vimana is 66 meters tall and is decorated with intricate carvings of Hindu deities and scenes from the Mahabharata and Ramayana epics.

The Brihadeeswarar Temple is a masterpiece of Chola architecture and is a testament to the power and wealth of the Chola dynasty. It is one of the most popular tourist destinations in India and is a must-see for anyone interested in Hindu art and architecture.

The other options are incorrect because they are not styles of Chola architecture. Pallava architecture is a style of South Indian architecture that flourished from the 7th to the 9th centuries CE. Pandyan architecture is a style of South Indian architecture that flourished from the 9th to the 13th centuries CE. Vijayanagara architecture is a style of South Indian architecture that flourished from the 14th to the 16th centuries CE.