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A
The President and the Vice President
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B
The Senate and the House of Representatives
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C
The Supreme Court and the lower courts
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D
The states and the federal government
Why this is the answer
The two parts of Congress are the SENATE and the HOUSE OF REPRESENTATIVES. Together they form the bicameral (two-chamber) legislative branch. SENATE: 100 senators (2 per state), 6-year terms; HOUSE OF REPRESENTATIVES: 435 voting members, based on state population, 2-year terms; USCIS Civics Question: 'What are the two parts of the U.S. Congress?' — Answer: the Senate and House (of Representatives). Both chambers must pass a bill for it to become law (after the President signs it or a veto is overridden). The bicameral structure was a compromise (the Great Compromise) balancing representation between large and small states.
Source: USCIS Civics — Two Parts of Congress