The correct answer is (a) North Bengal.
Pundravardhana Bhukti was a province of the Gupta Empire located in the eastern part of the Indian subcontinent. It was bordered by the Ganges River to the west, the Himalayas to the north, the Brahmaputra River to the east, and the Bay of Bengal to the south. The capital of Pundravardhana Bhukti was at Pundranagara, which is now located in the Indian state of West Bengal.
Pundravardhana Bhukti was a major center of trade and commerce. It was also a major center of Buddhist learning. The famous Buddhist scholar Vasubandhu was born in Pundravardhana Bhukti.
Pundravardhana Bhukti was conquered by the Pala Empire in the 8th century CE. It remained under Pala rule until the 12th century CE, when it was conquered by the Sena Empire.
Pundravardhana Bhukti was a major cultural and economic center during the Gupta and Pala periods. It was a major center of trade and commerce, and it was also a major center of Buddhist learning.