The annulment of the Partition of Bengal, which had divided the province in 1905, was officially declared by King George V during the Delhi Durbar in December 1911. This decision was a response to widespread political unrest and protests, particularly from Bengali nationalists, who viewed the partition as an attempt to weaken their unity and influence. The annulment aimed to appease the agitated population and restore stability.
Options 'King George IV' and 'Edward VII' are incorrect. King Edward VII was the reigning monarch when the partition occurred in 1905, but he did not annul it. King George IV reigned much earlier, from 1820 to 1830, long before the Partition of Bengal. Therefore, King George V is the correct historical figure associated with this significant event.