The correct answer is option 3: statecraft. The Arthashastra is a classical work of Indian political thought that primarily focuses on the principles and practices of governance and statecraft. Statecraft refers to the art and skill of managing and administering a state or government. It deals with various aspects of political leadership, including the creation and implementation of policies, the maintenance of law and order, economic management, diplomacy, and warfare.

The Arthashastra, written by the ancient Indian scholar Kautilya or Chanakya, provides detailed guidance for effective governance and the maintenance of a stable and prosperous state. It covers a wide range of topics, including the role of the king, the administration of justice, taxation, management of the economy, foreign policy, and strategies for war.

The text emphasizes the importance of efficient governance, moral conduct of leaders, and the welfare of the people. It offers practical advice on how to establish and maintain a strong and stable government, protect the state from internal and external threats, and ensure the well-being of the citizens.

Overall, the Arthashastra is an important work that focuses on the art and science of statecraft, providing valuable insights into ancient Indian political thought and governance.