Which of these sentences uses a semicolon appropriately?
A) Although the concert doesn't start for over an hour; most of the fans have already arrived at the concert hall.
B) The concert doesn't start for over an hour; though, most of the fans have already arrived at the concert hall.
C) Most of the fans have already arrived at the concert hall; however, the concert doesn't start for over an hour.
D) Even though the concert doesn't start for over an hour; however, most of the fans have already arrived at the concert hall.