What time did his father arrive at the police station, and what time did he actually see Christopher?
a) Arrived at 5:00 PM, saw Christopher at 5:30 PM
b) Arrived at 6:00 PM, saw Christopher at 6:15 PM
c) Arrived at 4:30 PM, saw Christopher at 4:45 PM
d) Arrived at 7:00 PM, saw Christopher at 7:30 PM