which citizens' right does the Fifth Amendment protect? going to trial, testifying against anyone they know, military draft, testifying against themselves.

The fifth amendment does multiple things. One of them is making clear that the government can not obligate someone to testify against themselves.

The fifth amendment;

"No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a grand jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation."