According to the guidelines of good journalism, which of the following sentences is correct: A. 9-year-old John Messer broke his wrist when he fell off a skateboard
B. John Messer, 9, broke his wrist when he fell off a skateboard.
C. John Messer, nine, broke his wrist when he fell off a skateboard.
D. John Messer, a nine-year-old, broke his wrist when he fell off a skateboard.