The statement that best compares the rights of a U.S. state to the rights of a U.S. territory is:
C. U.S. state governments are granted powers by the U.S. Constitution, while territorial governments have no constitutional rights.
This statement accurately reflects the fact that U.S. states are granted powers by the U.S. Constitution, including the power to regulate commerce, levy taxes, and establish their own legal systems. Territorial governments, on the other hand, do not have the same constitutional rights as states and are instead granted powers by acts of Congress. While they do have some degree of self-government, their authority is ultimately subject to the federal government.