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A
The Court of Appeals
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B
The District Court
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C
The Supreme Court
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D
The Federal Trade Court
Why this is the answer
The SUPREME COURT is the highest court in the United States. USCIS Civics Question: 'What is the highest court in the United States?' — Answer: the Supreme Court. It has 9 justices (1 Chief Justice and 8 Associate Justices), appointed by the President and confirmed by the Senate, who serve for life (during good behavior). The Supreme Court has the final say on questions of federal law and the Constitution; its decisions are binding on all lower courts. It can declare laws and executive actions unconstitutional (judicial review).
Source: USCIS Civics — Highest Court