4. how does article i, section 6 of the constitution protect members of congress?
o protects free speech for congressional debates
o allows members of congress to receive salary raises
o allows members of congress to mail letters for free
o protects members of congress when voting on a bill

Protects free speech for congressional debates.

Explanation:

United States Contitution, Article I, Section 6 "Speech or Debate Clause", clearly states that the members of the both Houses of Congress will be protected from getting arrested during their attendance, for any speech or debate. This exists so it can protect the members of the Congress from getting arrested and prevent them from voting or take actions for which the President might disagree. Treason, Felony and Breach of Peace are not included in this protection. This is also called an immunity.  

ok i will try

explanation:

a 3 branch government