It amuses me how both sides of the debate seek to interject their doctrine into a simple question.
What does "chosen to salvation" mean?
It means that God has chosen beforehand to save a particular people. What must one do to be saved? "Believe on the Lord Jesus Christ."
Now, y'all can debate all you want as to why some have faith and others don't, but that aspect doesn't need to be drawn into answering the OP.