Answer
B. Evaluating the decisions of lower federal courts.
Explanation
Appellate courts are in the judicial system with the responsibility of hearing and reviewing the appeals from legal cases that have passed the trial-level in the lower courts. Individuals or entities can go ahead and file an appeal with the appellate courts to have their decision reviewed if they feel the trial-level was not successful to them. The best example of a higher form of appellate court in the United States is the United States Supreme Court that hears appeals of major importance and outcome.
