"How can they (the Lost) Hear unless Someone is sent?"

Key Bible Verse(s): "How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? And how can anyone preach unless they are sent? As it is written: “How beautiful are the feet of those who bring good news!” Romans 10: 14-15