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A
The Declaration of Independence
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B
The Constitution
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C
State law
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D
The President's orders
Why this is the answer
The Constitution is the supreme law of the land. This question is part of the special 65/20 list — the reduced set of 20 civics questions available to applicants who are 65 or older and have been lawful permanent residents for 20 or more years. The answer is the same as on the standard test: the Constitution is the highest law, establishing the government and protecting basic rights. The 65/20 questions are a subset of the full 100, marked with an asterisk, and qualifying applicants study only those 20. The content is identical in substance to the standard civics questions.
Source: USCIS Civics Question 1 (65/20) — Supreme Law