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A
The District Court
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B
The Supreme Court — the final authority on federal law and constitutional interpretation, with nine Justices serving lifetime appointments
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C
The Court of Appeals
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D
The Federal Court
Why this is the answer
THE SUPREME COURT is the highest court in the United States. It is the final authority on: the meaning of the Constitution; federal law interpretation; disputes between states; and cases involving federal questions. Nine Justices serve: the Chief Justice of the United States and eight Associate Justices. They are nominated by the President and confirmed by the Senate. They serve for life (subject to good behavior) or until they retire or are removed through impeachment. USCIS Question 39 (65/20 list): 'What does the judicial branch do?' — Related question. The specific question about 'highest court' is Question 40: The Supreme Court.
Source: USCIS Civics Question 40 (65/20) — Supreme Court