The correct answer is: A. Thanesar
Thanesar was an important center of Hindus in the book of Al-Biruni. It was a major city in the region and was home to many Hindu temples. Al-Biruni described the city as being “a great center of Hindu learning and culture.”
Karnal was also an important city in the region, but it was not as important a center of Hinduism as Thanesar. Hathnikund and Surajkund were both small towns that were not as important as Thanesar or Karnal.
Al-Biruni was a Persian scholar who lived in the 11th century. He is best known for his work on astronomy, mathematics, and geography. He also wrote a book about India, which is a valuable source of information about Indian culture and history.
In his book, Al-Biruni describes Thanesar as being a “great center of Hindu learning and culture.” He says that the city was home to many Hindu temples, and that it was a major pilgrimage destination for Hindus. He also says that the city was a center of Hindu scholarship, and that many Hindu scholars lived there.
Al-Biruni’s description of Thanesar is supported by other sources. The city is mentioned in several Hindu texts, and it is also mentioned by the Chinese traveler Xuanzang, who visited India in the 7th century.
Thanesar was an important center of Hinduism for many centuries. It was a major pilgrimage destination, and it was also a center of Hindu scholarship. The city’s importance declined in the 12th century, after it was sacked by the Muslim conqueror Muhammad Ghori. However, Thanesar remains an important site for Hindus, and it is home to several Hindu temples.