Which of the following is true about the government's sovereignty?

The statement that the government cannot be sued without its own permission is accurate. This principle is grounded in the legal doctrine known as sovereign immunity, which protects the state from being sued in its own courts unless it explicitly consents to such actions. This means that governments are generally immune from lawsuits to preserve their functions and ensure that they can operate without excessive interference from private individuals or entities.

In practice, there are specific circumstances and statutes under which a government may waive its sovereign immunity, allowing itself to be sued. Understanding this concept is vital for recognizing the balance between the authority of governmental entities and the rights of individuals or organizations to seek redress against them.

The other options do not accurately reflect the nature of governmental sovereignty. For instance, it is not the case that any state can challenge a government's sovereignty, as this would undermine the foundational principle of territorial jurisdiction. The idea that sovereignty is derived solely from popular vote overlooks other important sources of authority and legitimacy. Additionally, while taxation is a significant function of government, sovereignty encompasses far broader powers and responsibilities beyond just tax collection.