Final answer:
The U.S. courts of appeals review trial court decisions, and they do not hear new evidence or use juries. Their decisions can be appealed to the U.S. Supreme Court, which selects cases of significant legal importance through the writ of certiorari.
Step-by-step explanation:
The U.S. courts of appeals, or circuit courts, are primarily responsible for reviewing trial court decisions within their geographic circuit. B. review trial court decisions is the correct answer. These courts do not hold trials or hear new evidence, nor are they the highest courts to use juries. Furthermore, the circuit court's decisions can be appealed to the U.S. Supreme Court, which is the highest court in the federal system and has the final say in federal legal matters. The Supreme Court decides which cases to review through the writ of certiorari process, and not all cases that are appealed to this court are heard; only those of significant legal importance, which usually involves a constitutional question or conflicting interpretations of the law.