Explanation:

Amur falcons, known as the world’s longest-traveling migratory birds, have already arrived in Nagaland, Assam, and Manipur, after traversing almost 29000 km from their summer breeding grounds in northeast China and southeast Russia. Hence statement 1 is correct.
• An international team of ornithologists declared Nagaland ‘the Falcon capital of the world’ sometime back after they recorded that around one million Amur Falcons roost in the region. This means that such massive gathering of these migratory birds can be seen nowhere else in the world, which also puts Nagaland on the global map, owing to its rich diversity.
• In fact, Nagaland has earned this title with its successful conservation efforts for these migratory birds. The sheer number of their population in Nagaland has now made it the ‘Falcon Capital’ of the world. It has been observed that the birds, in order to escape the harsh cold of Siberia, roost in Nagaland for over a month. These migratory birds also play a crucial role in maintaining the balance in the ecosystem and by keeping a check-in insect population. Hence statement 2 is not correct.
• Reportedly, these birds were slaughtered and eaten by the local people a few years back. However, with the support of Nagaland Forest Department and Wildlife Trust of India (WTI), awareness among the local people regarding these birds has spread.
• It’s IUCN status is least concerned. Hence statement 3 is not correct.
• Reportedly, these birds were slaughtered and eaten by the local people a few years back. However, with the support of Nagaland Forest Department and Wildlife Trust of India (WTI), awareness among the local people regarding these birds has spread.

Hence Option A is the correct choice.