Final answer:
In Social Studies, as part of the process of how a bill becomes a law, both houses of Congress must agree on the bill.
Step-by-step explanation:
In Social Studies, the process of how a bill becomes a law is taught. Congress plays a crucial role in the passing of a bill, and for it to become a law, both houses of Congress need to agree on the bill, which is option A. The bill being judged constitutional by the Supreme Court, option B, does not directly determine if a bill becomes a law. Option C, a majority of American voters approving the bill, is not a requirement for a bill to become a law. Option D, the bill receiving a unanimous vote by the House, is not necessary as a majority vote is sufficient.
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