Which level of the federal judicial system has only original jurisdiction?

The answer is C. Level one

C. Level 1

Explanation:

A court may have original jurisdiction or appellate jurisdiction, or both. In the United States, the District Courts, as the general trial courts of the nation and the first level of the federal judicial system, have original jurisdiction for civil and criminal cases, but they do not have appellate jurisdiction because none of the other courts can remit a case to an inferior court.