It would be A.
The French use the 24 hour clock.
For example:
Military Time: 12:00, 1:00, 2:00... 11:00, 12:00, 1:00...
24 hour clock: 12:00, 1:00, 2:00... 11:00, 12:00, 13:00...
So basically they say each hour as it comes, as to not be confused.
So therefore it would be A.