What purpose does this building serve?
a: the capitol building houses the u. s. congress, which debates and makes the nation’s laws.

b: the capitol building houses the u. s. supreme court, which decides the constitutionality of laws.

c: the capitol building is the home of the u. s. president, the leader of the nation’s executive branch.

d: the capitol building houses the three branches of the federal government, which make, execute, and judge the nation’s laws.

D. The Capitol building houses the three branches of the federal government, which make, execute, and judge the nation’s laws.  

Explanation:

The Capitol building is located in Washington DC and houses congress. It houses the legislative branch of US federal government.  The congress meets  in this building, Congress consists of representatives and senators from each of 50 states. It is located on the top of Capitol Hill. The House of Representatives meets in the south wing while Senate meets in the north wing. the Statue of Freedom is located on the top of the Capitol. The cornerstone for the Capitol began in September 18, 1793.

Explanation: