Choose the sentence that shows correct punctuation.
To his shock and amazement the door swung open it was never locked in the first place!
A.To his shock and amazement, the door swung open - it was never locked in the first place!
B.To his shock and amazement; the door swung open, it was never locked in the first place!
C.To his shock and amazement, the door swung open, it was never locked in the first place!