Imagine you were with Paul that day on the road to Damascus and you heard the voice of Jesus speaking to Paul, but you did not see anyone. How would you feel?

I would feel very confused and scared by that voice that I heard without seeing anyone.

Explanation:

By listening to the voice of Jesus; At first I would have been very scared because it was something I had never gone through in my life, but as surely I was going to remember what had happened years ago with Jesus that he was crucified but later resurrected, so now if I would be more convinced than ever of that Jesus is a real and very powerful being.

a and c?

i think it is a and c