Answer: (a)

Explanation:
The Amur Falcon undertakes one of the most remarkable migrations in the bird world, travelling from Mongolia and northeastern China to southern Africa, with India (including Doyang Lake) serving as an important stopover site.

Statement 1 is correct: the annual arrival of Amur falcons at Doyang Lake reflects the success of local conservation efforts in Nagaland, where community protection (including awareness campaigns and protection from hunting) has helped ensure safe roosting conditions for these migratory birds.

Statement 2 is incorrect: while satellite tracking has helped scientists study migration routes, there is no evidence that "advanced tracking technologies guide migratory birds back" to stopover sites. Migration is driven by innate biological navigation systems, not external technological guidance.

Statement 3 is incorrect because Amur falcons are not resident birds in India. They are long-distance migrants and do not permanently adapt to Indian habitats; they pass through seasonally during migration.