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A
The House and the President
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B
The Senate and House (of Representatives)
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C
The Senate and the Supreme Court
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D
The states and the territories
Why this is the answer
The two parts of the U.S. Congress are the Senate and the House (of Representatives). This is one of the 65/20 civics questions for older, long-term residents. Congress is bicameral, meaning it has two chambers: the Senate, with 100 members (two per state), and the House of Representatives, with 435 voting members apportioned by population. Together they make up the legislative branch that writes the nation's laws. Knowing that Congress consists of these two chambers is fundamental system-of-government content, included in both the standard and 65/20 versions of the test.
Source: USCIS Civics Question 17 (65/20) — Parts of Congress