I would pick one of the four Gospels because I believe the Word is a means of grace. So therefore you only allowed one option that uses the Word of God. although some of the other options have scripture in them, but I believe that I would evangelize each and every time with bible in hand.

I would pick the gospel of John, if I could only use one gospel. But I'm curious why you didn't allow us to choose "the Bible" as an option? But any way, I believe that I would feel most comfortable trying to articulate the gospel from John.

Dave.

Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified. - Galatians 2:16