Which article of the Constitution defines the legislative branch and grants power to legislate to Congress?

The correct choice is based on the fact that Article 1 of the Constitution explicitly establishes the legislative branch of the government. This article outlines the structure, powers, and responsibilities of Congress, which consists of two houses: the House of Representatives and the Senate. It grants Congress the authority to make laws, including the specific enumerated powers, such as the ability to levy taxes, declare war, and regulate commerce.

Article 1 serves as the foundation for the legislative process, detailing how laws are proposed, debated, and enacted. It also addresses the qualifications for membership in Congress and the processes involved in elections, demonstrating the importance of legislative representation in a democratic government. Understanding the content and structure of Article 1 is crucial for comprehending the role of the legislative branch and its function within the broader context of the federal government.