The correct options are
A 5:15 am
D 5:15
In 12 - hour format, the time before 12 noon is prefixed with 'am' and the time after 12 noon, with 'pm'.
So, the time that is the same as 5:15 in the morning is 5:15 am.
And, in the 24 - hour format, time after 12 noon gets added by 12 and that before 12 noon is left as it is.
Since 5<12, 5:15 in the morning in the 24-hour format is given as 5:15.