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A
Commands the military
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B
Makes the laws
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C
Interprets the Constitution
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D
Leads foreign policy
Why this is the answer
According to this sentence, Congress MAKES THE LAWS. Congress is the legislative branch of the US government. It consists of two parts: the Senate (100 senators, 2 per state) and the House of Representatives (435 members, based on state population). Congress's primary role is to write, debate, and pass laws. The President signs or vetoes laws; the courts interpret them. The USCIS reading test directly asks about the main action or function described in a sentence — 'makes' is the key verb.
Source: USCIS Citizenship Reading Test — Congress