Correct Option (B)
Assam, specifically the Sylhet district, proposed a plan for a united and independent existence during the Partition of India. This proposal was rooted in the region's unique demographic and political landscape, aiming to avoid integration into either India or Pakistan.
Incorrect Options:
Punjab was significantly impacted by the partition, leading to its division into East and West Punjab, and did not propose a united and independent existence. The province experienced widespread communal violence and mass migrations.
Bengal was also partitioned into East and West Bengal, with East Bengal becoming part of Pakistan (later Bangladesh) and West Bengal remaining with India. There was no widespread proposal for an independent Bengal during the partition.
Bihar was a Hindu-majority province and remained part of India. It did not present any plan for an independent existence during the partition.